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A lil mind game: figure at best it won't match the claimed +8 to 20% and at worst it won't be any worse than stock. 19 x 1.08 = 20.52; x 1.2 = 22.8. My WAG is, if it works at all, don't expect more than 1 to 2 mpg.
23,000m/yr @ 19mpg = 1210 gal/yr; @ +1 you might save 57 gal/yr; +2, 115 gal/yr. 1210g @ 2.80 = $3388.
As an example: $500 30 mpg car yields 767 gal/yr @ 2.80 = $2148.
You could find an econo beater that pays for itself in less than six months then it's all gravy after that.
Last edited by Frank Lee; 10-27-2010 at 08:36 AM..
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