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Doesn't seem that much different to how I calculate MPG improvements...change something, go through my usual driving cycle, observe the results. Although, the sample size probably isn't big enough, I'd say doing it over 3-5 tanks or so before and after would be a better way to test.
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'97 Honda Civic DX Coupe 5MT - dead 2/23
'00 Echo - dead 2/17
'14 Chrysler Town + Country - My DD, for now
'67 Mustang Convertible - gone 1/17
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