Has anyone considered the differences in gasoline quality from station to station, state to state? Check out smartgas.net. Supposedly adding 2-4 ounces of 100% acetone per 10 gallons of gas makes the fuel vaporize & combust much more effeciently improving MPG. Supposedly any alcohol mixed in the gas is counterproductive to MPG, engine life, & oil quality. Certain gas brands & certain states allow more of this. Lots of interesting info to consider on that site. Has anyone tried the spark plug gap reduction + adding acetone to gas? Says if you use too much it will lower MPG & the tailpipe will be cleaner but good for 10 - 50% better MPG if mixture dialed in right. Check out the ulta MPG tuneup section. Anybody use Torco products?