Probably gonna vary depending upon engine size (318 vs 360) and 2wd vs 4wd.
Taking all that into account, anywhere from 11-16 mpg.  Although I'm sure there's some folks here that can give you more accurate accounts of what they're getting.

 

oops sorry i left out that info 91-93 4wd 318 v8

 

Well, my old 87 RC, 318 4wd, I could get 14-15 on the highway.  I would think with the OD trans and fuel injection, the 91-93 would do a little better.

 

Here's a couple other threads where this has been discussed before.

http://ramchargercentral.com/boards/index.php?topic=65140.0

http://ramchargercentral.com/boards/index.php?topic=58105.0

 

on my 85' truck, the highest i got was 15mpg, and that was taking it super easy. Normally though, i get about 10-11mpg, but thats my fault, because my foots always in it. lol

 

My 1993 Dodge RamCharger, 4x4, 318 Magnum, A518, posi-rear, 191,000 miles.... is getting highway around 15-18 mpg and city around 10-12 mpg.  That is with all original equipment, aka original tranny, original engine.

Ryan

 

My 93 Ramcharger with 6" lift 33" tires 4:10 gears 360 magnum 187000 miles 11 mpg in the city 15 hwy hope it helps I'll have to let you know what it does next week when I add the 35" tires, ya it will be cool to only loose1 - 2 mpg max, later IM OUT>?RH