I recently had changed the tires on my 2000 Mustang. I went from stock 205 width to 245, so about 4cm wider on each tire. I noticed a large change in MPG (2-3 mpg overall) I used them for about a month and decided I couldn't live with the change. They looked amazing, but with the amount I drive, I couldn't stand the loss.
My overall changes went from around 24-25 on normal driving to 22-24. Highway went from 28-29 down to 26-27. I changed them back about a month ago and it has corrected to normal. My tank from yesterday was actually a new record of mine, 34 on a 220 mile highway trip.
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2002 Jetta GLS TDI 345k+ miles, all mods listed in description 156HP, 298FT/LB
The eclipse has retired, but I still like seeing it around
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