I have no idea....

Ok so I have a 1986.5 NA Supra, and for some reason I am getting the worst gas mileage ever. It cost me about 35 dollars to fiil it up, about 14 gallons, and I'm only getting around 220 miles to the tank!! Someone please help me!!!

220 miles to 14 gallons, or 19 gallons? How heavy is your foot? This will make a huge difference in the gas milage you get. If you drive like a granny it will improve, floor it everywhere and you get 11-12mpg like you are now. Around town stop and go driving compared to constant throttle highway driving will also have a huge effect. Other factors could be a problem also, bad O2 sensor, faulty AFM, vacc leaks, old spark plugs, weak spark, fuel problems, the list goes on. When was the last time you did a full tune up on the car, replacing all of the filters and items listed above? Either way, even though it is an N/A don't expect any incredible MPG numbers, it's not a hybrid and it wasn't designed for fuel saving. :p