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Instrumentation. It's hard to improve your driving style if you only get feedback on it every few hundred miles, and driving style has a bigger impact on fuel consumption than mods.
Low rolling resistance tires almost always get bad reviews. Most people can't reliably detect the fuel economy improvement, so all they see is the loss of traction and increase in noise. Ignore the reviews, get LRR's.
Aside from that, how do you feel about a grille block and an alternator kill switch?
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