[liquidzorch]

I have a 93 civic lx, d15b7 engine and s20 manual transmission. The engine has been rebuilt, since it was burning oil. But I still only get around 28-30mpg. It might not sound that bad, but I see people with the same engine getting higher mpg and not using the same driving methods I do.

I never press down on the gas pedal more than 1/8th way down, I mostly only tap it down very little to move. No hard acceleration. I shift at about 2k-2.5k depending on the load. And never go above 65mph. Most of my driving is done on highway like conditions, since in the city we have over 40 overpasses, I hardly ever have to stop.

The ECT, TPS, AIT, sensors are new, which are most effective with gas. The injectors are cleaned and tested. When I am at a stop and it idles for more than 30 seconds, I can hear/feel it entering a lean burn. But I imagine while accelerating it injects more gas. I hooked up a voltmeter to the output of the oxygen sensor, and I can see about .1 volt when in idle for more than 30 seconds (lean burn mode), but when tapping on the accelerator, the voltage goes up to .8-.9 volts. I do not know if that is normal in this car.

My compression does not seem to be that bad, it is about 160psi all across, It should be at 180psi when new, so I say its not that bad.

I have no vacuum leaks. And cat is not clogged.

Any help would be appreciated. Thanks