What gas mileage will a 1997 Dodge Ram 2500 4X4 V10 get?

A 1997 Dodge Ram 2500 4x4 with the V10 engine will get very poor gas mileage. You're looking at figures in the range of 8-12 MPG (miles per gallon), and likely closer to the lower end of that range, especially with heavier loads or towing. This is heavily dependent on driving conditions, maintenance, and how aggressively the truck is driven. Expect significantly lower mileage than a smaller, more modern vehicle.