Quote:
Originally Posted by Vwbeamer
... lowering the truck did drastically improve the gas miliage. ...
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I would say it's reasonable to conclude with your evidence that lowering improved your fuel economy, given the magnitude of the improvement. But we can't really know how much (whether it was a drastic improvement) without more rigorous testing. Subtle changes to other factors could be contributing (weather, driving style, routes, and more...)