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    Thread: 2.5 gas mileage thread

    1. Junior Member dcdude's Avatar
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      '08 Jetta 2.5 5-spd
      08-11-2010 05:12 PM #26
      Did anyone do any A/B testing before and after adding CAI and/or cat-back? I'm curious which of these has a positive or negative effect on gas mileage?

      Also- which CAI is least likely to cause a CEL on in '08?

    2. Member dr0pthehamm3r's Avatar
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      08-11-2010 10:02 PM #27
      hit 337mi til gas light on Chevron 91oct. 06 jetta w 5spd. stock engine.
      //FRRG - Norcal

      Follow my build: dr0pthehamm3r: The Full & Overly-detailed Story
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    3. Member Schagephonic's Avatar
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      08-12-2010 01:01 AM #28
      Quote Originally Posted by dcdude View Post
      Did anyone do any A/B testing before and after adding CAI and/or cat-back? I'm curious which of these has a positive or negative effect on gas mileage?

      Also- which CAI is least likely to cause a CEL on in '08?
      CAI alone made no noticable difference for me. The AWE catback did though by adding about 10% more mpg. I'm also running a revised 87 octane C-2 chip which I can verify with my Scan Guage that the chip is shutting off fuel at hwy speeds when I lift my foot off the gas. The stock chip does not do this. So using a gentle touch of the throttle on and then off again (repeating) technique, I'm consistantly getting 34 mpg hwy cruising at 75mph. I just completed a trip in the CO mountains and averaged 36 mpg cruising at 65mph.
      Prior to my mods, I was getting between 29 and 31 mpg hwy. Also, keep in mind that your tire width, diameter (which affects weight) and rolling resistance will also make a difference too.

      I've not had any CEL's using my Neuspeed CAI.

    4. Member VWShocker's Avatar
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      08-12-2010 01:54 AM #29
      Quote Originally Posted by Schagephonic View Post
      CAI alone made no noticable difference for me. The AWE catback did though by adding about 10% more mpg. I'm also running a revised 87 octane C-2 chip which I can verify with my Scan Guage that the chip is shutting off fuel at hwy speeds when I lift my foot off the gas. The stock chip does not do this. So using a gentle touch of the throttle on and then off again (repeating) technique, I'm consistantly getting 34 mpg hwy cruising at 75mph. I just completed a trip in the CO mountains and averaged 36 mpg cruising at 65mph.
      Prior to my mods, I was getting between 29 and 31 mpg hwy. Also, keep in mind that your tire width, diameter (which affects weight) and rolling resistance will also make a difference too.

      I've not had any CEL's using my Neuspeed CAI.
      You are hitting my MPG secret (the C2 chip).
      A Jetta with mods

    5. 08-16-2010 02:54 PM #30
      2006 2.5 5 SPD Jetta
      32.7 MPG @ 70 MPH HILLS, FLATS, 325 MILES

      Thinking about a cold air intake for better mpg any other suggestions?

    6. Member VWShocker's Avatar
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      08-16-2010 07:54 PM #31
      Quote Originally Posted by cpsvr6 View Post
      2006 2.5 5 SPD Jetta
      32.7 MPG @ 70 MPH HILLS, FLATS, 325 MILES

      Thinking about a cold air intake for better mpg any other suggestions?
      Tune is the BIGGEST helper.
      A Jetta with mods

    7. 08-17-2010 11:19 AM #32
      Quote Originally Posted by VWShocker View Post
      Tune is the BIGGEST helper.
      Tune? What do you mean?

    8. Junior Member dcdude's Avatar
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      '08 Jetta 2.5 5-spd
      08-17-2010 11:22 AM #33
      Quote Originally Posted by VWShocker View Post
      Tune is the BIGGEST helper.
      "Tune" meaning "software" rather than timing, plugs, points and condenser, right?

      Specifically, the C2 Motorsports 2.5L Performance Software? Was anyone able to get this done locally? Was it "while you wait" fast to get? I'm concerned about the downtime and risk of shipping my only ECU anywhere.

    9. Member 07Jetta's Avatar
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      08-17-2010 12:37 PM #34
      2007 Jetta
      Cabrino CAI
      -average about 26miles per gallon
      -best to date.... 29miles per gallon and got a little over 400miles out of the tank, 406miles I thihk to be exact.

    10. Junior Member dcdude's Avatar
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      '08 Jetta 2.5 5-spd
      08-17-2010 01:20 PM #35
      FYI- I just drove my new bone stock 5 speed CPO '08 SE back from Tucson. Just 225 pounds of me driving with 2 small bags. Here are my stats based on three partial tanks and fill ups:

      85 MPH average: 24 MPG
      75 MPH average: 27 MPG
      70 MPH average: 32 MPG (almost. 31-point-something and change!)

      Sweet spot might be 72 MPH to get 30 MPG.

    11. 08-17-2010 02:21 PM #36
      08 2dr Rabbit Tiptronic
      No mods except larger sticky tires (245's on lightweight 17's)

      Day to day driving, which is 80% stoplights, and 20% cruising 45-60mph, I average 22-24mpg
      This is taking it easy too.
      When filling up after an autocross, its about 21.

      Full on highway driving, I've gotten 35 before, but I was drafting a semi doing 60 most of the trip. Typically though, It will sit around 31-32 cruising at 75-78.


      Driving around in the summer I get worse mileage due to the AC being on constantly, during spring and fall I get 26 on my day to day with windows down.

    12. Member VWShocker's Avatar
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      08-17-2010 07:30 PM #37
      Quote Originally Posted by dcdude View Post
      "Tune" meaning "software" rather than timing, plugs, points and condenser, right?
      correct
      A Jetta with mods

    13. Member
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      '74 Bug (yard), '96 Jetta 255K (yard), '02 Cabrio 104K (sold), '06 Rabbit 127K BGP, '08 Jetta 55K
      08-20-2010 11:26 PM #38
      '06 Rabbit 5 speed
      87 octane
      suburbs
      23-24 mpg fairly conservative driving

    14. Member richard_rsp's Avatar
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      08-22-2010 12:11 PM #39
      Its amazing how much tire pressure affects these cars. (2010 Golf 2.5, 5-speed)

      I have the 17" Goals and normally run around 37 psi. I usually average about 25mpg around town and 30mpg on long trips.

      I got my oil changed about a month ago and have noticed a decline in my gas mileage. (like averaging 18mpg in town and highway of 25mpg)

      Checked my tire pressure yesterday before I left on a trip and noticed that all four tires had been reduced to about 29.5 psi. (Thanks local VW service dept. obviously they dont realize that with 17" goals, that it is supposed to be at 34 psi!)

      Anyway, now they are back to 37 and I got 34.9 mpg on my trip yesterday (55-65 mph)

      Keep them tires pumped up, especially with the larger, wider tires!

    15. Member thygreyt's Avatar
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      08-22-2010 11:03 PM #40
      i am gettin consistent numbers... 25 city and 28 at hwy (80mph)

    16. 08-23-2010 10:11 PM #41
      I have noticed this as well. Tire pressure makes a significant difference with this car.

    17. Member Schagephonic's Avatar
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      09-01-2010 09:48 AM #42
      Want an instant 10% more MPG? Try to find non-ethenol "enriched" fuel. I found some in Ft. Collins, CO and filled my near-empty tank, reset my Scan-Guage, drove to Denver. Normally I get about 32.5 mpg on this highway run as there's a slight elevation gain. This time I achieved 36.2 mpg. I'll continue to seek out more of these gas stations and do more monitoring of the data.

    18. Junior Member
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      09-02-2010 02:37 PM #43
      I was getting about 24mpg on average with the recommended oil. I switched to 0w-40 and now I get about 25 or 26mpg. Also, I noticed running 91oct or better improves my mpg.

    19. 09-03-2010 08:22 PM #44
      Here's mine

      Pure stock
      87 Octane gasoline

      Best MPG = 46.4 MPG from San Diego to Sacramento
      Longest range = 596 miles/tank

      That was all back when I was doing >90% highway. Now with 50/50 mix driving and shorter trips, it's quite a bit less now. I was hoping to get my lifetime average up to 40 MPG, but that's not going to happen given my current driving situation.

    20. Member
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      '74 Bug (yard), '96 Jetta 255K (yard), '02 Cabrio 104K (sold), '06 Rabbit 127K BGP, '08 Jetta 55K
      09-04-2010 12:26 PM #45
      26 per gallon last fill up around town. I'm not really sacrificing many mpg compared to my 2.0L Jetta with racks (28 winter, 30 summer around town).

    21. Member jtrujillo86's Avatar
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      09-04-2010 04:51 PM #46
      I haven't been too impressed with the 2.5's city MPG. For the last two years in grad school, all I really ever drove were city miles to and from school. Every tank would amount to about 23 miles per gallon. Now, I'm working about 35 minutes away from my house and have a 65 MPH highway drive every day. I'm consistently seeing between 32 and 33 MPG

      - Jeremy.

      EDIT: And all this is on 87 octane. If I use 85 I see about a one mile per gallon drop in both the city and highway.
      Last edited by jtrujillo86; 09-04-2010 at 04:53 PM.
      Quote Originally Posted by BluMagic View Post
      It's a VW; the sensors are as sensitive as women on that time of the month . . . and the dash is as anxious to light up as a stoner.

    22. Junior Member dcdude's Avatar
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      '08 Jetta 2.5 5-spd
      09-05-2010 10:14 AM #47
      My last two city tanks were 20 and 21 MPG. Granted, I still have my foot in it from time to time (hey- it's my new car) but I try to drive and shift between 2,000 and 3,000. My commute is only 7 miles each way, which can't be good, but I wonder if something's wrong? Checked tire pressure recently. I do haul around 2 car seats and a stroller, but that can't be 100 pounds of crap.

      I like the idea of experimenting with 91 octane, but I wonder if it will pay for itself?

      Also considering 0W-40. There is strong suspicion that Porsche specs it to cheat up their CAFE numbers.
      Last edited by dcdude; 09-17-2010 at 02:54 PM.

    23. Member jtrujillo86's Avatar
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      09-05-2010 10:21 AM #48
      Quote Originally Posted by Schagephonic View Post
      Want an instant 10% more MPG? Try to find non-ethenol "enriched" fuel. I found some in Ft. Collins, CO and filled my near-empty tank, reset my Scan-Guage, drove to Denver. Normally I get about 32.5 mpg on this highway run as there's a slight elevation gain. This time I achieved 36.2 mpg. I'll continue to seek out more of these gas stations and do more monitoring of the data.
      I live near Drake and Timberline in Fort Collins, so I'd be interested to hear at which station you found this. Also, ethanol has lower energy content than gasoline, so it's less efficient. I don't doubt you'd see a sizable increase in MPG by using non-enriched gasoline.

      - Jeremy.
      Quote Originally Posted by BluMagic View Post
      It's a VW; the sensors are as sensitive as women on that time of the month . . . and the dash is as anxious to light up as a stoner.

    24. Junior Member NickVW's's Avatar
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      09-07-2010 12:52 PM #49
      My 07 Jetta 2.5 manual
      Average 375-425 a tank winter-summer 87 octane 90% highway
      Highway and city mpg don't vary much for my driving
      Best ever was 33 mpg

      My Fiance's 08 Rabbit 2.5 auto
      Average 325-375 a tank all year round 75% city driving 87 octane

      We took a trip to Florida in the rabbit and averaged somehow 36 mpg on cruise control doing 80 mph on 87 octane

      I think they put pixie dust or something in southern gas

    25. Member VWShocker's Avatar
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      09-07-2010 11:48 PM #50
      Quote Originally Posted by Schagephonic View Post
      Want an instant 10% more MPG? Try to find non-ethenol "enriched" fuel. I found some in Ft. Collins, CO and filled my near-empty tank, reset my Scan-Guage, drove to Denver. Normally I get about 32.5 mpg on this highway run as there's a slight elevation gain. This time I achieved 36.2 mpg. I'll continue to seek out more of these gas stations and do more monitoring of the data.
      I used a whole tank full of gas the other day searching for non-ethanol petrol. No luck except that I was able to score some 101 octane.

      Gonna try it out before the big day.
      A Jetta with mods

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