I get 26mpg on interstate with the I6, K&N filter, and exhaust system
AMG can't build an NA engine that can compete with M engines, so they stick in a supercharger and say their cars are faster. BMW could simply do the same, but they don't out of principle.</span>
if you are really driving fastup hills and stuff, 25 is ok, i get 25-30 with a heavy foot.
slow down if you are that worried. but if ur only doing a soft 60mph, then get a tune up.
use good gas
check exhaust for leaks
clean the throttle body
in short....DO ALL the routine check-ups and small stuff.
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