Quote:
Originally Posted by hayden55
I would say your testing conditions have a real world error of a handful of percent. So it would really be impossible to test if that stuff really worked with such a low percent change. Maybe if your car got 50.0mpg evey month of the year it would be more verifiable.
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I tend to agree. The driving conditions are not as consistent as I would like. Plus we have things like changing seasons and occasional maintenance issues skewing the results. Also, this method of testing fuel economy takes a long time.
Most of the mods I'm doing are aerodynamic. So I think it would be a good idea to try some coast-down testing.