1989 ford ranger 2.9v6 bad gas mileage

can someone please help mne out i have an 89' fordranger 2.9l v6 and i am getting like 10-12mpg. i don't no whats wrong. it doesn't leak oil, i don't have a lead foot, just replaced o2 sensor and gas and air mixture sensor. please help me out.
you can email me at mattyman888@yahoo.com

A whole lot of things could be wrong but lets start from basics. Does your car start OK and does it idle right? Does it accelerate up to speed fairly well? and OK at freeway speeds? Check out simple things first like tire pressure, alignment, fuel filter, air filter, etc.

when i start my truck it wheels then it will start, when it starts it revs up to 2 then will come down to 1 1/2 then when it warms up idles at 1to1 1/4.

What did you mean by the numbers? RPM? That sound you hear when you first start could be that at times your starter disengages before your engine had time to start. Need answers to my other questions.

ok the numbers mean rpm's, and after my truck starts it sounds like the starter is being shredded. if that makes any sense to you. accelerates up to speed quick. also the fuel filter has just been replaced and i put a k&n air filter in it to tire pressure is good and alignment is good. please respond back. thank you.

Remove your starter and I will be willing to bet that you'll find the gears in pieces. Also check the flywheel. Since you said your car starts, it sounds like there still something there that turns your engine but it sounds inconcievable that the starter does not disengage cause otherwise the starter armature will be turning at tremendous RPM can could blow up. In any case I believe your starter is shot.

so will that haveanything to do with bad gas mileage? and what else could be giving me bad gas mileage, please respond back. thank you.

As I pointed out before, we need to address one system at a time. If you have starter problem having the best mileage won't do you any good. First you have to get the engine running right, that is, idling, acceleration, etc. If everything is OK, then you can address the mileage issue. If the engine or the power train system is not running right, you're going to have lousy gas mileage.