Posted: Nov 05 2008 at 6:13am | IP Logged

Well, city mileage is stop and start.  Remeber with heavier tires, it takes far more energy to spin them up to speed than a lighter tire.  And it takes more braking to get them to stop..  That being said, winter fuel composition may have a thing or two to do here.  Once in motion, all it takes is enogh energy to overcome friction, rolling rsistance and wind resistance.  These may be fairly constant with a slight increase in rolling resistance.  Stop/start requires accelerating a heavy mass and uses a lot of fuel.  Are you doing more stop/start in the city than you used yo? Are idle times longer?  Is traffic heavier?

Just some things to consider.

Posted: Nov 05 2008 at 4:20pm | IP Logged

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Ethanol is hard on steel and (think injectors here) plastics. So bad about destroying stuff that e-85 cars have to have stainless steel gas tanks and fuel lines plus many other parts.

Have a good one while you can still laugh about it.. Don S..

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