what is the size of the gas tank on an 07 dodge ram hemi, 4WD,4 door (i don't think it's the mega cab). Is it 26 gal or 34, i've only had the truck for about a month and always drive my work van to work, so i haven't really filled it up from empty yet

 

look in owner's manual. My gas tank is 26gal

 

My tank is 34 gallons, but it is the optional larger tank, not the standard 26 gallon.

 

From the shop manual....FLUID CAPACITIES DESCRIPTION SPECIFICATION FUEL TANK
1500 Short Box 98L (26 US Gallons)* 2500/3500 Short Box 128L (34 US Gallons)* All Long Box 132L (35 US Gallons)* Cab/Chassis Models (Standard/Rear- Mount) 197L (52 US Gallons)* Cab/Chassis Models (Optional/Mid-mount) 83L (22 US Gallons)*