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On my 97 Ram 4x4 360, I am seeing about 16mpg on the highway, and in the city about 11-12mph after my plenum fix, new cap,rotor,plugs & wires and no air cleaner (till I mod my cold air intake on lol). My sisters 2000 Ram with a 360 does 20mpg, seems you can go forever with that truck! and shes not nice to it either!, I thought she was full of $hit getting that kind of mileage till I took it on a 100 mile round trip to pick something up and I only put in like $15 to top it back off.
My buddies 04 Hemi truck consistently would do 14mpg at 55-60mph. Though when I drove that I was always into the gas pedal.
Last edited by JoshSlash87; 08-10-2012 at 12:10 AM.
i don't think a plenum gasket or o2 sensor would help if he is doing 100% city driving with a 4x4 truck. i know any of my trucks drop to about 9 or 10mpg if i do all city driving and i got 5.2L's.