really simple... bought a touted high milage car ... drive like normal...
= better milage ... actually we seem to drive a bit more aggressively in the 2012.
currently am running test of 2000 mustang 6 vs 2012 hatch ... after a few more tanks of gas and rotating driving/cars between wifie/me will report results.
Already wifie has preference for 2012 ... as more fun to drive and more lively. but mustang sounds better even though it's a six.