i vote 4 banger.
im a die-hard 3.0 fan...but i think the 2.3 will best suite your (his) needs. they usually come in base model trucks (read: cheap), they do great on gas, are reliable to boot (about a tie between the 2.3/3.0), and a 2wd truck is pretty light, the 4 popper will scoot it along decently.
i would also teach him to drive a stick though. it will get better economy, be more reliable, and have better get-up-and-go. and its best to teach them now so if there is a need for him to drive a stick in the future he can.
i vote 4 banger.
im a die-hard 3.0 fan...but i think the 2.3 will best suite your (his) needs. they usually come in base model trucks (read: cheap), they do great on gas, are reliable to boot (about a tie between the 2.3/3.0), and a 2wd truck is pretty light, the 4 popper will scoot it along decently.
i would also teach him to drive a stick though. it will get better economy, be more reliable, and have better get-up-and-go. and its best to teach them now so if there is a need for him to drive a stick in the future he can.