The first thing I would check would be to make sure the choke is operating properly and opening fully when the engine is warmed up.
Then I'd check the airfilter (and air tube that leads to the air cleaner housing to make sure there are no restrictions in there (and make sure the thermal door thing that pulls air from around the manifold isn't stuck in the "up" position.)), spark plugs, wires, cap & rotor to make sure they're all in good condition.
Next, I think I'd be checking things like idle mixture, to make sure it's not running rich, and ignition timing to ensure that the spark fires at the right time to get the best efficiency.
Synthetic fluids (oil, differential lube, ATF in the tranny and T case) will allegedly get you some increase in mileage (hard to say how much, and if it'd be worth it or not), I think you might find the problem in the first couple of items...
Do you drive it hard, or just nice and slow acceleration, not trying for fast? Is your transmission a manual (4 or 5 gear) or automatic? How high does it rev when you're at your normal cruising speed?
After giving mine a tuneup some mainly highway driving (55-85) got me around 20mpg (haven't calculated it yet, but will soon to be totally sure)... Do you do mainly city or highway driving? My 85 has an optional 20 gallon tank... [img]/wwwthreads_images/icons/crazy.gif[/img]
ORC Land Use columnist
My August article on ORC