Where you buy your gas does make a difference. A friend of mine drives a mini cooper and so far he claims that he gets the best mileage using Shell gasoline. I’m currently testing that claim for myself.
Another idea I havn’t seen mentioned: Yor car uses a lot of gasoline to overcome air friction and drag. Keeping your car clean will lower the friction coefficient and improve gas mileage. If you are really into lowering air friction, check out products like Protect-All AVP-15 or Logisti-clean which are being used on cars, freight trucks, even airplanes to reduce air drag. They also protect your paint and resist dirt adhering to your exterior, which increases air friction. However, I’m not sure how much these products cost to apply.
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