2.8L Duramax Fuel Mileage
Everybody who considers buying a Colorado, Canyon, or Express van seems to be interested in fuel economy numbers and just about everybody I see publishing their results uses the number their vehicle’s computer reports.
Being more interested in raw data and measurements, I’ve been recording all of my refueling using the app, Fuelly, to track my mileage. I’ve found that the computer is a bit optimistic, but the numbers still fall within the stated fuel economy.
Below is a dynamically updating banner from Fuelly which will show my fuel mileage over time as I continue to drive the truck - click on it for more detailed info!

Here is what the computer shows my fuel mileage is:

Originally published on MidMichigan Oil LLC, independent AMSOIL dealer, restored from archive.