I just leased a 2012 TDi Golf 6speed manual, it's the first new VW diesel that I've owned although I had a nice MKIV TDi Jetta for a few years. I was always amazed at the mileage I got from that car, 40's around town and mid 50's on the interstate. I knew that the newer CR diesels don't deliver as much fuel economy but I've been a bit disappointed with the first 2 tanks, an overall average of 38 MPG.
I'm not a big fan of those 17" wheels that come with the TDi and I can't help but wonder if the 225 wide tires are costing me a few MPG's. Has anyone tried to switch to a 16" or even a 15" wheel/tire combo to see if the MPG improve at all? I'm considering picking up a set of 15" steelie/tires to use as winter wheels next year but I'd run them if there was an improvement in economy.
Thanks for any replies!