SLANT 6 a GAS GUZZLER?

grassy said

..there are oddities..my 96 2wd ram 1500 with a 318 used to get highy30s on the highway...my new ram, not so good..

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I would guess there was something wrong with the odometer. In 96 with OBDII you could set the tire size in the computer. Likely had a setting for a much larger diamter tire than was installed on the truck.