I get 20 to 21 mpg on my 2021 1500 bighorn with 3.92 @ 70mph. I’m considering having the 33 gal tank installed. I have a 31’ travel trailer max wt is 7700 lbs. I get about 10 mpg towing. I usually go about 60mph so l’m taking it easy. With the 33 gal tank the extra gas would give me a range of...
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