Hi, Guys:
I would like to report my observed Mile Per Gallon on 2006 S80 AWD.

Based on the message from the trip computer, my average MPG is 26.4 mpg
during the past 100 days of 5345 miles, out of which is roughly 1500 miles
driven in local streets with lots of up/down hills.

The very latest long distance drive during Independence day weekend, from Nagara Falls to New York City, I made 455 miles with 15.3 gallon premium gas, which is 29.73 mpg! I had 500lb load on the car and AC was on throughout (interior temprature is 70F and 80~86F outside), average speed 75 MpH.

I cannot complain at all on the exceptional performance.

Cheers!