I really don't want to buy a used truck just because I can't buy a new gas engined truck with a manual transmission. The six speed is nearly ideal with its spread of ratios, while a five speed with a close ratio for the first four gears and a fifth OD would be perfect for any gas engined truck. I've been buying manual from my first new vehicle(1972), not because they were cheaper, but rather, because I prefer to row my own. And every vehicle I've had got better mpg than the ratings. None of that pesky downshifting on a snowy hill to spin you out either. I've tried a diesel, it was alright, but the manual transmission without engine control or exhaust brake was worthless on hills and it had so much torque that there was really no need for more than two forward gears.