13-14 MPG on average. Before losing the clutch fan, it was 10-11, and 12 on the best days. I blame the larger tires on the low mileage, since with the stock sized tires, I was getting 13-14 and my record was 16 MPG driving from Spokane to Everett on HWY 2.
i know that when i put an electric fan on the 350 in my rock crawler it seemed to make a noticable difference in power but then again i was running a fixed big freaking cadillac fan before