Quote:
Originally Posted by MetroMPG
Not the best test methodology (driving several thousand miles on one type, then switching to another type), but at least they admit as much.
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In my testing of mods, I like to compare a 3-fill average to a 3-fill average from the same time period of the previous year. My fuel log shows the difference:
Switching to Mobil 1 0W-30 from Motorcraft 5W-30 gained ~ .5 MPG.
Pizza pan wheel covers made NO difference in MPG. (I don't care what others have
"proven" while still "adjusting the nut behind the steering wheel"), they made
NO noticeable difference in my
2007 Ford Mustang's fuel economy.
Programming the ECU in my Mustang for optimum performance with Premium (91 octane) fuel and filling it with
premium fuel resulted in a loss of around 1 MPG.
Installing a 25% under-drive crankshaft pulley on the 4-Liter Cologne V-6 gave me a gain of about 1 MPG.
As always, YMMV.