Having fully tightened lug nuts also helps with fuel economy. On my trip to Virginia at one point I noticed my fuel economy dropping, so I pulled over and tightened 15 of the 16 lug nuts a quarter to half turn each. Fuel economy jumped right back up after that.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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