I originally thought I was doing better than 8 to 9, but that's what it is. 2019 E350 Conquest 6.8. with a 4:56 rear end. Thats ensuring my tires are properly inflated and I try to keep it 62 mph, rpms not over 220, use my cruise control, ensure oil is maintained and air filter is clean. I do occasionally through some Lucas in the tank also.
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