Hey live4soccer7, lol... looks like we both made our way over here.
The 1st gen 4runners are 3700lb approx, so not much heavier than an MX83 (fawking tanks I tell ya)
So... Geared and setup properly, you'd get 20mpg I think. I don't think it's unrealistic or unattainable. Just keep your foot...
Well, I'm lining up all my ducks to get started on this.
The truck will be in the garage for a teardown likely next week some time.
Plans are:
SAS (haven't decided between FJ80 axles or just a Toy/Hilux front just yet)
R150 v6 transmission
1uz from an SC400 (pretty much have access to...