I have a Ram 3500 CTD, it holds 5.5 gallons. In 5 years of full timing I average about 340 mpg. This is towing a 21k 5ver. Ram states in there manual, do not top off. When I get below a 1/4 tank I fill it up.
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2016 DRV38RSB3
2015 Ram 3500 Regular Cab DRW CTD Asian trans 410 rear
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