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    VWVortex


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    Thread: 12V VR6 Fuel Economy

    1. 07-14-2008 11:33 AM #1
      Hey all,

      I'm interested in hearing what MPGs everybody else has been getting out of their 12v. I did a forum search but it sucks and I couldn't find another thread discussing this. If there is, just link to it and I'll contribute to that one!

      I've been getting into hyper miling sans the crazy stuff, and I'm averaging 30-31 out of my Passat on each tank. I regularly get 33-35 on my 20 mile commute to work, which is 90% highway.

      What about it? I've heard others brag about getting 40-44 out of their Passat, but I'm having a bit of trouble believing that. Let me know if you've done anything to get better mileage. That said, NO this is not meant to be a thread discussing the ins and outs of hydrogen generators (been there done that on WAY too many forums).

      Thanks!


    2. 07-14-2008 12:47 PM #2
      I was getting horrible mileage in my 2000 Jetta VR6 until this last saturday. I was avg about 23 mpg on my 15 mile commute to work all hwy. I bought some throttle body cleaner and some MAF cleaner. Took the hoses off and sprayed the MAF sensors really well then sprayed some of the TB cleaner into the TB. I was AMAZED at the difference in both Throttle response and fuel economy and power. All I can say is WOW.

      Immediate power increase, butter smooth acceleration and restored power.

      I took my car for a 400 mile trip yesterday and used about 12 gallons. That's 33.3 mpg! Sooooo much happier with that. Not to mention I was passing a few cars on the divided hwy (including a VR6 Jetta wagon, haha) and it was like nothing for my car to pour on the speed. Without even knowing I went from like 70mph to 100...

      Hurrah MAF cleaner!
      Best 6 bucks I've ever spent. It only took about 15 min to clean it too!

      Trevor


    3. Member Mr_Long's Avatar
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      07-14-2008 01:02 PM #3
      Quote, originally posted by ShortTom »

      What about it? I've heard others brag about getting 40-44 out of their Passat, but I'm having a bit of trouble believing that.

      x2

      87 GLi ---> 94 Golf ---> 95 GTi ---> 02 GTi AUQ

      K03S, Wetterauer tune, 3" Magnaflow exhaust, 3" Ebay DP, EIP clutch, DogBone poly inserts, Hyperboost XS, Power Gasket, FK Springs, APR Turbo inlet, Ebay FMIC, Genesis Pump, BFI MK4 Stage 1 Mount Kit, Performance Polyurethane Strut Mount Bushings ...

    4. 07-14-2008 01:07 PM #4
      calculated I get 26mpg mixed driving, 50 miles round trip to and from work...according to the MFA it reads on average of 26-28 mpg...which isn't too far off, and quite good considering the MFA isn't the most accurate gauge to use

    5. Member mk2vrooom's Avatar
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      07-14-2008 01:25 PM #5
      ive gotten 33-34 out of one of my old VR's driving mostly highway but at roughly 80mph average...

    6. 07-14-2008 01:43 PM #6
      mk2vroom,

      So basically I feel really inadequate with my 33 mpg now...only one word can describe how I drive now: painfully. If I drove 80 I would get 24-25 mpg. I'm getting some MAF and carb cleaner asap!


    7. 07-14-2008 01:51 PM #7
      708,

      Quite the contrary on the accuracy of the MFA, I've found it to be dead to rights every time, so much so I don't even check my fuel economy manually anymore. The only accuracy issue I've had is that it doesn't read hundredths...and to be entirely honest the old fill-er-up-and-reset-the-trip method is pretty much a guesstamate.

      At any rate, its close enough for me...I haven't been able to convince myself to spend $160 on http://www.amazon.com/gp/produ... this to get scientific measurements!


    8. 07-14-2008 01:57 PM #8
      I was just looking into the scangauge too, and like you I too feel that $160 for a computer to "calculate" my gas mileage is a bit much

    9. 07-14-2008 04:39 PM #9
      Quote, originally posted by ShortTom »
      I've heard others brag about getting 40-44 out of their Passat, but I'm having a bit of trouble believing that.

      Are you sure they were running a V6? I've heard the 4 bangers can get that kind of economy but I've only heard average 28 or so with the VR6's...

      Also, why is the reset the trip fill up the tank method a guess? If you fill the tank till the pump clicks and then reset the trip... drive.. then fill the tank till the pump clicks again, how is this a guess? The pump will tell you exactly how many gallons you pumped and the miles from the trip tell you how many miles that much fuel got you... I suppose there's "some" slop there but not more than a mile or two from the guesstimate.

      All I know is that before cleaning I was down at around 23 consistently... for months.

      Now it's up above 30. My trip/fill method says roughly 33. I'll take that over 23 any day!

      I don't see why you're complaining about 33-34 mpg. Like I said above, I've only ever seen the specs for VR6's to list 28 hwy. Maybe the 1995 models were better?


    10. 07-14-2008 05:58 PM #10
      Dimon,

      Not complaining! I think its good fuel economy, but I'm always on the hunt to get more out of 'er!

      About the reset trip method of measuring gas mileage...its inaccurate because it depends largely on the 'click' you mentioned. If the specific gas pump you're using pumps gas faster (makes the gas more turbulent going into your tank), you'll get less in the tank before the foam of the gas makes the pump click (ie, "better" fuel economy). If you pump slower you'll get more in there (and your fuel economy will suddenly be "worse"). Even if the difference is only .5 gallons, on a 5 gallon top-off that's 10% gas mileage fluctuation that has nothing to do with your machine performance!

      My only point is that I believe the computer measurements on the MFA are probably AS reliable if not MORE reliable than the trip setting method.


    11. Member
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      07-14-2008 06:31 PM #11
      driving like a 'normal' person around town i get 23mpg. having a little more fun i get 20mpg. highway at ~70mph i get 32mpg

    12. Member RnB_VduB's Avatar
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      07-14-2008 08:44 PM #12
      im getting about 30-31 mpg it got better since i got my oil change...

    13. 07-14-2008 09:33 PM #13
      I should add that I used to get about 18-19 mpg back when the engine was 100% stock and properly tuned, with absolutely no issues, misfires etc...since going with a chip, 262 cams and exhaust my fuel mileage has made an awesome improvement...even now with the stock airbox and exhaust I still get 26mpg...mixed driving that is, I should go on a long highway trip and record my mileage then


      Modified by 708VR6 at 9:03 AM 7-15-2008

    14. Member xblueinsanityx's Avatar
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      07-15-2008 12:30 AM #14
      i have never gotten over about 26 in my vr6 corrado but now i get even less with boost
      bend it , cut it , grind it, weld it....... drive it! ..... break it........

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      07-15-2008 12:55 AM #15
      I got about 30mpg on a recent trip. That was with the MFA reading 26.2 avg, traveling 80-90 mph most of the way. This was in a chipped 'rado with CAI and cat-back.
      My drinking team has a racing problem.

      RWD VR6 Turbo? Oh my!

    16. 07-15-2008 12:58 AM #16
      on the highway for a 400 mile round trip doing 70MPH:

      32 MPG

      city driving shifting at 2K rpms:

      25 MPG


    17. Member cgeromi's Avatar
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      07-15-2008 01:07 AM #17
      I consistently get 31-33 mpg on the highway. That is at 75-80mph. Also running 93 octane religiously. Around town, I get 21-25 depending on my mood and also the weather plays a big factor. Pump up those tires. The more air pressure the better mpg's you're gonna get. Within reason of course.

    18. 07-15-2008 09:38 AM #18
      xblueinsanityx,

      Sure your boost isn't "boosting" your foot pressure?

      (j/k)


    19. 07-15-2008 09:51 AM #19
      Wooohooo! Got 35.4 on the way into work today, 20 mile trip on country/city roads, average trip speed ~ 40 mph, shifting at 1250 rpms (seems smoother there than 1500) timed every green light correctly except one, engine running the whole time but with lots of coasting. Four people passed me, one angry look, no Hawaiian hellos. Total trip took 4 minutes longer than normal driving, 6-7 minutes longer than pedal-to-the-metal.

      Oh, I want a K&N. Anybody convert to a cone filter and have one they want to get rid of?


    20. 07-15-2008 11:04 AM #20
      24mpg average

      40mpg max, drafting a semi on a 300 mile road trip on relatively flat ground

      15mpg lowest, while pulling a 2600 lb. u-haul trailer from Ventura CA to Claryville NY... sucked, don't do it.


    21. Member vrsixpower's Avatar
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      07-15-2008 02:58 PM #21
      i get on average 20+/- a few but my MFA button doesnt work all the time. does anyone else have this problem?

    22. 07-15-2008 03:23 PM #22
      Yep, that's the status of my MFA as well...I'm pretty sure the problem's with the button itself since I just have to push the button several times for it to work. Seems like it messes up more when its cold outside.

    23. Member vrsixpower's Avatar
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      07-15-2008 07:12 PM #23
      yea thats what i used to do but it just doesnt work anymore. w.e im sure ill figure it out

    24. 07-16-2008 01:19 PM #24
      i get about 25 to 28 highway

    25. Member wolfsbur's Avatar
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      07-16-2008 04:05 PM #25
      1993 Passat wagon

      I get about 28 MPGs on the highway at 60 MPHs--hilly inland Maine (ambiant temp above 60, 205 width tires at 40 psi, Mobil 1 10W 30). Auto trans, engine with 104K miles.

      A friends 07 2.0 TFSi Passat wagon--6 speed auto, gets about 33 on the same route with A/C on and going 75 MPHs. Tires are 235s IIRC. Pisser!


    26. Member HumboldtCorrado's Avatar
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      07-17-2008 01:13 AM #26
      just checking in... if i keep out of the go-pedal and keep cruise control on, i get a solid 30-31mpg highway @ 65mph. and i don't get any more tickets. ('00 GTI)

    27. 07-17-2008 04:54 PM #27
      My insurance are just now starting to come down after all MY speeding tickets...maybe there IS a bright side to high gas prices...

    28. 07-17-2008 08:27 PM #28
      Quote, originally posted by ShortTom »
      708,

      Quite the contrary on the accuracy of the MFA, I've found it to be dead to rights every time, so much so I don't even check my fuel economy manually anymore. The only accuracy issue I've had is that it doesn't read hundredths...and to be entirely honest the old fill-er-up-and-reset-the-trip method is pretty much a guesstamate.

      I am going to have to agree with 708 on this one. I took a 275 mile trip to NY over the holiday weekend. My MFA said I was averaging 27.5 mpg, but when calculating it manually, my mpg was just over 31. I got the same readings from the MFA on the way back down, and calculated 29.7 mpg manually

      And please explain why you feel the "fill-er-up-and-reset-the-trip" method is inaccurate? Knowing that you can never leave the gas station with the exact same fuel load each time, I still find calculating "miles/fuel added during fill up" mpg to be very accurate.


    29. 07-17-2008 11:18 PM #29
      My wagon is a dog. Plus I only get about 20mpg. It feels like the motor is being strangled. Anyone around around the Cincinnati area that could show me what a good running VR6 is like?

    30. 07-18-2008 08:15 AM #30
      Planforrobert,

      Interesting...I'm about to make a 250 mile round trip over the weekend so I'll check it out again, but it's always been accurate for me in the past. huh.

      My view on the fill and trip measurement method is basically what you said: you'll rarely leave a gas stations with exactly the same fuel load twice. Depending on your capacity, a small difference in the amount of fuel in your tank can make it look like you're having notable mileage swings, when in fact you may not be.

      I'm not trying to be a about this! I still use this method quite often in other vehicles and take is as gospel truth, but my simple observation is that as a rule it is less than precise.

      Take my opinion for what it's worth... $.02!

      edited for baaaaddd grammar


      Modified by ShortTom at 5:17 AM 7-18-2008


    31. 07-18-2008 08:31 AM #31
      Tom,

      I'm with you on your reasoning, but if you are maxing out your fill up every time, your fuel load should only fluctuate between .2 and .3 gallons . Yes, there is a factor of error there, but I don't see it being more than +/- .5 mpg....and that's fine by me.

      Enjoy your weekend kids, happy motoring


    32. 07-18-2008 09:40 AM #32
      Hm, this has got me thinking. I did some searching online and I found several other points regarding on-board fuel consumption monitoring systems versus trip-reset method.

      -The actual number of miles traveled (odometer or trip reading) is inaccurate in itself since it determines miles traveled by differential shaft rotation, so tire pressure and tire wear will make small discrepancies in actual distance traveled over time, effecting both computer and trip methods of measuring mileage.

      - Fuel mileage computers calculate the "requested fuel injection" amount of gasoline, so the computer doesn't compensate for dirty injectors, though differences in air mixture would effect the calculation. (not too sure that this is true in every case)

      - Filling up at gas stations of different altitude will have an impact on the trip method, since gasoline density is effected by altitude (less dense at higher altitudes?).

      - Temperature also plays a big role in effecting the variability of your gas mileage using the trip method, higher temps will mean less fuel in a "full" tank since more vapors cause the nozzle to shut off prematurely. Higher temps will also create more vapors causing some (albeit a small amount) of those to be recaptured by the fueling nozzle.

      So whatdya think? Do I get presented with the "Completely Anal Retentive" Award? Nominated at least?

      Ha! Just food for basically useless thought...

      Funny what $4.09 per gallon of regular will make us talk about!


    33. 07-18-2008 09:52 AM #33
      Quote, originally posted by ShortTom »

      So whatdya think? Do I get presented with the "Completely Anal Retentive" Award? Nominated at least? YES

      Ha! Just food for basically useless thought...

      Funny what $4.09 per gallon of regular will make us talk about!

      funny what $4.xx/gl gas does to some people, me in particular, I went and bought a new even more economical car, plus the fact that I want to park the gti and keep the miles low, she is after all my baby


      Modified by 708VR6 at 8:57 AM 7-18-2008


    34. 07-18-2008 09:56 AM #34


    35. 07-18-2008 10:30 AM #35
      Check it baby, in yo FACE! WHO da man!

      ROFL!!


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