[suspectnumber961]

Here is something from mpgresearch.com....

85 22R Toyota carbed ...96 HP....85 EFI....116 HP

I've been making the same effort with my '88 Toyota
4wd 5speed with 222K miles and I manage between 27.5
and 29.7mpg. This includes some city driving, perhaps
25%, and some hauling, perhaps 15% of the time and up
to ~ 3/4 ton in the back: truck weighs ~3,800
unwashed, rust bucket and lots of tools behind the
seat. Those are also pretty good numbers but, now,
with the Saturn, I hope to use the Toyota only for
what it does best: hauling/mud and snow work.

Best I can do with an '86 Nissan EFI 4x4 is 25 mpg highway...in summer.

If the truck has not been maintained...such as lubed and tuned up...you can gain some there. I'd put a pint of water into the carb (slowly) to decarbon it...flush the oil with a pint of kerosene for 15 mins...advance the ignition some....lube the driveshafts...check the gear oil levels and / or replace....up the tire pressures.