[Demonic_Bloodfeind]

Ok, so I'm trying to rehabilitate my truck from its currently handicapped state into something that will not kill me on gas.
the specs are so:

Year: 1990

Make: Chevrolet

Model: C-1500

Trim: standard cab w/t (work truck)

Engine: 4.3l v-6 TBI

Trans: 3spd hydro-turbo 400

Drive train: F/R 2wd

Odometer reading: 200,xxx

Original avg mpg: 17mpg

Current avg mpg: 15mpg

Engine oil:5w-30 caster-oil edge syn W/ 1/2 quart lucas

Trans fluid: atf W/ 1/2 quart of lucas

Diff oil: ?????? (best guess is 80-90W)

Tires F: Master craft avenger g/t (P255/R70R15) 40% tread

Tires R: Good year wrangler A/T (P235/75R15) 100% tread (new)

Gas tank compacity: 40 gal

HP: 160hp

Torque (lb-ft): 235

Stock weight: 38xx

Add on's: 1990 ford camper (overlap 1" in front/ 2" in back squeezed 250-300 lbs best guess)

New parts:
heater coil/ egr solenoid/ egr valve/rear tires/ filters/ oil/ egr vacuum lines/ spark plugs/ coolant/ wipers/ spark plug wires/ egr and air cleaner gasket/ air cleaner/ trans vacuum line/ audio system/ gas cap/ R/P tail lights bulbs.

missing, broke or deleted:
a/c (disconnected)/air damn (broke/deleted)/ f/p fender (dented/ attempted to fix just ended up putting holes in it)/ interior light (deleted)/ thermostatic air cleaner valve (deleted/ because it was broke)/O2 sender (missing)