[1990 GMC gas hog]

Alright, I bought this truck freshman year. I know I know but I have a huge interest in cars. I fixed this truck over that summer and she's my baby. I currently have a cold air intake and throttle body spacer, and she's getting about 16-17 mpgs. She got ten when I bought her, so she's come a long way since then. She costs close to nothing to fix since shes so old and reliability is awesome, never broke down on me yet. I would like to get better mpg's out of that 205,000 mile chevy v8. Where should I start? Nothing that makes it look ridiculous. And cheap stuff for now, Im only making 100$ a week until summer. Thanks guys and I look forward to being a active member on this forum.