Lucky or unlucky?

[needspeed]

Originally Posted by King

Are you guys posting your mileage based on what it shows on the on-board computer, or did you actually fill up the tank and calculate it based on the distance driven??

For those of you that went from a 4.8i to the XM, was it a noticeable difference in the mileage?

I did get 398 miles on a tank running it to the bottom and the trip computer showed I had 17 miles left. Tank took a little over 20 gal to refill. So that is really close to 20MPG. This was on a long trip with 1 rest stop and average of 80MPH on cruise control and not mashing the gas to pass......Steve