|
A few years ago I was commuting 90 miles each way to work, all highway. With my Silverado getting 18MPG I was burning 10 gal/day and had to refill the tank every other day. I switched back and forth between Speedway and BP and kept records of every tank. After 7 tanks of each I averaged out my miles and gallons and found that I got 1.5 MPG better with the BP than the Speedway. I'm not sure why but there was enough data that weather should have been factored out.
When doing this type of comparison remember that you have to add up your total miles and total gallons then calculate MPG, don't just average the MPG of each tank, especially if you fill up at different intervals, ie half a tank one time and 1/4 the next. You can't average averages. It don't work.
|