Go for the gusto, cars larger than yours got near 40mpg with a 3sp auto and the good old fashioned 5.7 or 4.3 DX block olds Diesel. Put a 5sp with decent gears and your landcruiser will probably get 40mpg. So long as you have good gears and are carefull those motors can pull also. The later goodwrench motors when coupled with a fuel water separator were almost bulletproof. My fathers 79 5.7 diesel pickup is still on the road, he sold it with 120k in 1990 if that means anything.
The 6.2 diesel is very similar to the 5.7 in terms of fuel economy but tows weight around much better, but it would give you a bit of a FE hit, how much I don't know. I do know the "C" series 6.2's tended to be very close to the 5.7 on MPGs though
Cheers
Ryan
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