sled. if your truck is running strong and you take real good care of it, the gas mileage can be comparable to some of the new suv/trucks on the road today. don't forget with a subaru you will need premium gas if you opt for the turbo.
It's a diesel. I've gotten as much as 23 MPG, but usually it's around 18 or 19. It sucks ass for where I live though. I have to plug in the block heater in the morning and it will fire right up, otherwise it isn't happening. Kind of a pain in the ass.