Not an upgrade but keeping the air filters clean and the tire pressure correct makes a big change. Also driving style as spearfish mentioned has a huge effect. If you keep the multifunction gage on instant mpg and modify how you're driving to get the best rate of fuel burn your mpg goes up more then you might think. I had an XB before and would many times get highway or better mpg during around town driving. The added benefit is you usually are carrying less energy in case of an accident. Good question
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