4:10 rear versus gas mileage..1999 truck

[72freak]

I did a post a few weeks and and got little to no response. I thought I would try again before moving on to other places.

I am looking at 1998/1999 2500 and 3500 Chevy suburbans and crew cab trucks. I insist on the 5.7 and 2wd. A good bit of these trucks end up with a 4:10 rear. I have never owned a daily driver type vehicle with that rear end and was wondering if anyone has that combination and could clue me in on their gas mileage. I would like to know mileage on 4x4's also. Below is one I am looking at.

Any help would be appreciated

DAvid