89FHPLX is getting such good gas mileage because of his rear end gears. I too can get about 340-350 miles on a tank of gas. I have a 3.08 rear end with the stock manual tranny, and even at 65-70 I'm still only turning about 2000 rpm. I only run 89 octane...have run the high grade and don't notice any difference in how well the car runs or increase in gas mileage...best mileage so far was 30 mpg on the highway on Mobil 89 after an oil change and replacing my spark plugs! It's a sad day though when my 5.0 gets better gas mileage than my 4 cylinder Tacoma! (I know an import...but hey, I couldn't afford the FORD truck I wanted so I had to settle for less...at least I'm got the right car on the road!)
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