Quote:
Originally Posted by BMWCCA1
EPA test is the same for every vehicle. For an auto trans they put it in D and run the cycle which is generally at an average speed of around 56-mph for the highway figure. It is for comparison purposes, nothing more. Don't know if it's still the case but, in the past, once the figures are calculated there is a 15% reduction in calculated versus what's on the sticker to compensate for manufacturers cheating on their calculations.
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What they should do is create different sets of tests for different classes of vehicle. Performance cars should get more aggressive tests, which would show that the smaller turbocharged motors do not in fact have better fuel economy when driven the way a performance car will typically be driven.
Of course there's no real incentive for the EPA to do this. Plus they'd argue you shouldn't be driving so aggressively anyway.