Not too long ago i had work done on my car, and the fuel pump, filter, and computer were replaced. Gas mileage was still bad, then my rear driver sdie tire was reallly low, so i put air in it an it helped out a lot. Well anyway, after that point, when i put chevron gas in my car (i usually put $15 in my car when i put gas in it which is bout 1.69 a gallon for chevron). I go about 125 miles or so, before the low fuel light comes on. I put in aboutt 8.8 gallons or so. Now when i put shell gas in it bout 5 or 10 cents cheaper, $15 gives me 9.0 gallons, an put about the same amount of gas in it, (no changes in driving habits) i go about 145 miles before the light comes on, i always use 87, so i didnt put 89 shell or 87 chevron, both 87. Could it be my car just gets better gas mileage on shell, as i just had to put gas in it today.