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When my car was fully stock - I was getting about 320 miles per tank and filling up when the low fuel light would pop on. (~11-11.5 gallons) I was driving pretty conservatively - 3000-3500rpm shifts, coasting when I could, maintaining roughly 75mph on freeway.
After I switched to Dunlop Star Spec tires on the stock rims I dropped about 40 miles per tank (~3mpg). Before the tire switch I never really paid much attention to the term "low rolling resistance" with my tires but grip comes at a cost and seeing my mpg drop this much from a simple tire swap was eye opening.
If you've swapped tires, this may be something to consider if you're worried about fuel economy.
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