As someone else pointed out, gas stations are just another method of profit production. I don't really care about the 15cents/gallon I'll save on filling my teg - one fill is ~10gallons, so I save about $1.50, my $2.00 if I pump at a cheapie instead of Chevron or Mobil or Shell...besides, I like the fact that these places are tidy, no line ups for pumps, free air and vacuums...plus its sort of given that their gasoline is not tampered with.