What's the gas milage for a gasoline Ford F-350?

4, maybe 5 with the wind at your back.

I se that, or 2020, Ford is bringing back an updated 7.3 litre gas AND twin turbo diesel. The twin turbo is a bit much for a diesel because I dont predict great mileage, whereas the old turbo 7.3 had a great MPG with its best road performance in the NOoverdrive position.
I have a 2016 6.2 turbo diesel F350 shortbed and a 2003 7.3 that Ive had tricked out and totally rebodied with big wheels (not the Tijuana style) and new lit of atuff that would bore you. I love the 7.3 and have to beat down the folks who keeps wanting to buy it. Ive got 80K miles on it and, for all problems Ford made for themselves, body integrity and rust is the worst (until the hardened Al body). The AL body is a great solution IMHO because they never "got it" about drainage holes in doors and fenders.

PS the original 7.3 diesel got an honest 20mpg. I dont know what the V10 was packin but it wasnt a 460 cid

Pushrod too.

Now if we can just convince them to drop it in a Mustang.

http://www.fuelly.com/car/ford/f-350_super_duty
http://www.fuelly.com/car/ford/f-350

These pages don't separate city and highway that I can see. But there is a drop-down menu that allows you to specify the engine.