a 2500 series with gas motor has to be a pig on gas.

i have a '14 ram 1500 and around down it struggles to get 10mpg. on the high way its great though getting 20ish.

honestly in that year range, a chevy 2500 is probably a better pick, in that they are cheap and fairly bullet proof.

ironically, i sold my 99 k2500 when i got my ram 1500