This time around, I thought I was doing fairly well considering my trip. On my latest tank, I had mastered a few new techniques, and in general practiced DWL better than usual among other things. My tank average was 53.3 on the fuel display, which is pretty good for me considering I have fairly short trips, always ending up a hill that costs me big time.

However, my fuel light came on a lot earlier than anticipated. When I filled up and compared the miles driven on my trip odometer to the gallons purchased, my mileage came to 42.8mpg! That's more than a 20% discrepancy, and highly unusual considering my very conservative driving technique.

The thing that I'm confused about though is that the sales receipt said I purchased 13.278 gallons... (I ran the pump until it clicked, didn't overfill) Considering the fuel warning light just came on, and there should have been about a half-gallon left at least, it later occurred to me the station's pump might be miscalibrated (I later remembered the tank is only about 13 gallons)

Has anyone else noticed anything like this before?