All,

I know that there is a big thread on this forum regarding the difference between the dash MPG display and the trip computer MPG display. I've been trusting the trip computer to date.

However, the last couple of tanks, I've been verifying the MPG reported by the trip computer against doing the division myself (trip computer miles divided by gallons reported on the gas pump when I fill up).

This last time, trip computer said 28.8 mpg, but dividing the trip computer miles by the gas pump gallons, I got 27.4mpg.

Has anyone else noticed this - any clever explanations for it?

Thanks,
Wes