Upper grill block, without a doubt -- it added ~10% to the FE and was about 10' feet of tape.
[Edit: of course the free things are excellent value! Driving techniques and pumping up your tires are both nearly free. For air pressure, you either have to pay some quarters every time, or you buy a good pump -- I got a very good hand pump. And stopping your engine at stop lights means that you use the starter more...
Brakes are use 'em or lose 'em: if you don't use 'em often enough, they rust away!]
Last edited by NeilBlanchard; 12-07-2009 at 09:59 AM..
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