2.7l in the F150 4wd is in the what 18/23 range (city/highway) on a much heavier vehicle but with smaller stock tires. I was thinking the 2.7l in the Bronco with 33s would be around that range with maybe 2 mpg less with 35s. On road off course. So if you were 16/21 with 35s what would it be off-road. Maybe high teens for gentle off-roading and 10-15 for harder, slower stuff. That's why that tank is so small. I hate the thought of carrying a ton of fuel all the time for 250-300 mile day trips off road which are common by me (with no fuel in sight).
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