MaxQ

I have an '86 300zx NA. New NGK plugs and wires, 5Zigen muffler, Weapon R Ram Air kit. I am averaging about 10-12 mpg on the street, 23+ freeway. I like to punch it from light to light, but nowhere near enough to qualify me for that sh***y mileage. Any suggestions? Any questions? I'd be glad to answer them and get some improvement ideas. I'm switching out my MAF next week (rough idle at startup). All comments welcome.

Zen31ZR

Check timing. Also check the o2 sensor , that one has the biggest effect on fuel mileage. It's basically impossible to test without a guage , you might as well just replace it , it's not that expensive. Kinda a pain to get to though , at least on the turbo cars.

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1992 Yamaha FZR 1000. 145 Hp, all stock..

MaxQ

thanks. just ordered one from motorsport auto. I'll let you know how it turns out.

NCSUracer

pull the hose that connects to the throtle body off the throttle body and see if you have a bunch of gunk built up there- use a little brake cleaner to get it out. That may help gas milage some and will help throttle response.