87 ranger
 

I bought a 87 ranger to use a daily drive and save my other truck. The thing is it gets 9 miles a gallon. Are there any ways I can increase the mpg, I'm thinking in terms of adding parts. I have heard that cool air intakes increase mpg slightly, but are there other parts you can use to help more.

I would look into finding out why your Ranger is only getting 9 mpg first before you ad hop ups.
Your 87 Ford Ranger is TBI Right?

I'm not sure if it's TBI, how can I find out?

TBI is Throttle Body Injection.
Your truck is either throttle body injection or a carburetor.

Either way, I would start with a FULL service on your fuel delivery system and ignition system.
Start with a TBI cleaner and fuel filter.

If the mechanical advance in the distributor is gummed up and stuck, it could do this.
You can put a timing light on it, disconnect and plug the vacumn advance hose, if equipped. Watch the timing mark as you raise the r.p.m.s to 2 grand. If it moves, not this, if not, is