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Originally Posted by dejav0o
Is it possible that since the tires are stickier when we first roll off the lot, that our mpg goes down? Or is it pure mechanical, in terms of the engine needing to break in that's causing the bad mileage.
On my previous car, I noticed my mileage significatly decrease when I purchased new tires, -60 miles per tank. But it slowly improved over time. In my 330, I noticed I got terrible miles initially too, but now it's doing great... my friends tease that my car must get bad mileage, until I mention that I avg 28 mpg.
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Actually the ECU lets the engine run richer when it's new. It's not because of the tires.