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Premium Member
7,231 Posts
There are many things that will cause one truck to get much better mileage than another. Your Ram is alot newer and benefits from many advances in performance and economy as compared to your older RC.

Things like automatic overdrive, improved engine management, better aerodynamics, etc. will all benefit the newer of the two trucks.

It's hard to know why the RC gets worse mileage without knowing more about it and any modifications done to it (Such as a lift or swapped axle gears, etc)

You can gain a small improvement in fuel economy by making sure the tires are fully inflated, theres no drag in the brakes, you top off everything that holds oil or lube with a synthetic, you acellerate slowly and maintain a consistant speed. (It also helps to drive about 5 mph under the posted speed limit)

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