nope, i go solely off calculated mileage between fill ups. i have the older 12valve cummins, the new ones you linked to don't get nearly as good of mileage as the 12'ers. also i have 3.54 gears and 35" tires which lowers the rpm's signifigantly and makes for better mpg'sIm gonna have to call bs on this. Seems like most people are getting around 20mpg tops with those trucks.
http://www.cumminsforum.com/forum/3rd-gen-powertrain/135916-3500-4x4-dually-mpgs-06-5-9-a.html
Are you going off your readout on the computer because that normally isn't accurate.
ok ok I'll believe you on the 26 mpg but 40 mpg for a stock suburban? Is that even possible if its modded?
fords are a little more difficult than chevys for regular maintenance. Read: 1/2 hour air filter change on a 7.3TD