Cummins mpg vs 225 Slant 6 mpg

it will be replacing a 1999 ford ranger, 4 cylinder, 5 speed. slow, and gets terrible gas mileage for a 4 popper. right around 20.

new daily MUST be a truck and MUST have a manual transmission.

it will sometimes be used to trailer my scamp as it has 4.10 gears and the two closest drag strips are several cities away. this factor could be exempt though.

all I know about the swap is it was done by a shop called "Murley's Mopar Performance" in Kentucky and it is one of their "shop trucks".

also, my commuting involves lots of freeway driving, which is a concern of mine for the '74 being that is only a 3 speed.