headdamage
Observer
My old 1983 6.2 Suburban used to get around 22mpg on the hwy (3/4 2wd with 700r4). There are a couple of over drives for the LT230 but they would require modification of the floor of the RRC to fit. My 1996 6.5TD Suburban gets around 17mpg hwy but it has the heavy duty towing gears, it does around 2400rpm @ 70mph.