My late father-in-law had a GMC pickup in the mid-70's 6V53 that was a gas version of the diesel. In that time fram gas V6's were somewhat rare. Probably the only downfall of the engine was its weight due to being a diesel block. It was a real nice performing truck and pulled through all 4 gears very smoothly. I don't recall anything on mileage when I made 2 trips from southern PA to upstate NY.
While we are on the issue of DD's, anyone ever heard of a 4L110? We had one down in Antarctica in 1969. We put it in a big Snowcat that we put together as a dry chemical fire fighting unit. We put a Fuller 4 speed and 2 speed reduction unit behind it. In 1st and low gear you had to get out and drive wood stakes in the snow to see the progress, but could that thing climb a grade!!!!!!!!!!!!!!!!!!
