just want to share my experience with both Shell and BP...
i usually use BP on my X, but tried Shell for a couple of months since its convenient for me, its right next to where i park everyday. But i noticed i only get less than 100 miles whenever the gauge hit the 3/4 mark, and get less than 300 miles in a full tank. Using BP before, i get around 350 miles per tank. (no refill for me until the light is on)
my last refill was at a BP station, got 120 miles on the 3/4 mark...
you do the math....
