 I use this to tow my race cars. It does a great job. I replaced my 2001 F150 Supercrew with the F350. I've done a best of 22 mpg at 60 mph on cruise control. Towing I get 13-14 at 65 with a car on a trailer behind me. Around town it's 10 or so unloaded.  It's so quiet I barely hear it running. This is unlike any diesel I've ever been in. I will likely drive this truck until it dies.