darrin-
im having the same problem...i checked my mileage on the way up there to see what i got uphill vs. downhill....every time i fill up, it stays at full for about 50 miles, then drops like a rock to 1/2 then it seems to be about normal from 1/2 to 1/4 then it goes really slow from 1/4 down...and i dont have a gas light anymore (i dont think, i havent seen it in a long time and i usually put about 20-21 gallons into the 22 gallon tank)