My mom had a 2000-ish grand caravan with a 3.3 and I averaged 30 mpg with it over a 180 mile trip. It would have been better, but we kept stopping for food and potty breaks. The average sat at 32-34 for a long time during the trip. We got into some hills and stop and go just before getting home so it dropped. The van was stock and full of us and cargo.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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