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Old 06-11-2008, 08:55 PM   #28 (permalink)
flobeelicious
1.4 Liter Turbocharged ECOTEC
 
Join Date: Jan 2003
Posts: 88
Re: 2009 GM Vehicles Post MPG Increase; Saab Aero 4Cyl Pkg; Malibu Hybrid Gets Big Bo

Quote:
Originally Posted by Snafu_SS View Post
Aren't they essentially just hard compound tires?

I've heard one person saying that they changed out the tires and rims on their Civic Hybrid for larger wheels and tires and saw a huge drop in mpg...guess the weight and less resistance can add up.
not doubting that the tires may make some difference - but if the tires/rims weren't a +1,+2 etc, that would be the bigger factor. if the overall circumference of the tire was larger, the speedometer/odometer would read lower than it should, and hence apparent mileage would drop.
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