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I know this goes for SRW trucks, and i don't see this as any different on DRW's. The LB fuel tank is 38 gallons, (ive gotten 44 in before), and the SB tank is 29 gallons. They are mounted "midship" on the left frame rail in front of the axle. They also make an "aft-axle" tank that is 40 gallons,most trucks don't have them. 450's and 550's have them standard however.
Get a SB truck with a V-10, and you won't PASS any gas stations LOL!