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My quad cab 2wd with 3.55 that I drive about 99% city averages 16-18mpg. When we do highway travel (camping, travelling out of state, etc...) 20mpg at 70-75mph is easy and 21-23mpg at 65-70mph is doable.
 

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Fuel Economy,13.85,litres per 100 km,16.98 miles per US gallon, 20.4 miles per Imperial gallon

bone stock, this is what im getting and mostly highway driving with 3.55 gears. its pretty consistant and doing about 110km/hr.
 

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I have a 4x4 4.7l with 3.92's (upgraded from 3.55), my fuel economy change was negligible between the 2 gearsets. Consistently 14 mpg or less in town if I have a downtown type environment where the speed limit never exceeds 30 or so and stoplights every coule hundred yards. regular In town driving nets 16-18, hwy is 20-24.

one thing about the 4.7 though, it is a strong engine, but the Ram is a heavy truck...if you get a headwind on the highway you will be drinkin' fuel. I have gotten as little as 15mpg hwy, if I get a nasty headwind.
 
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