You might want to check your error codes for problems with your o2 sensors (or just look at them, though I really don't know how to tell). They monitor the air/fuel ratio, and if they are malfunctioning or not working at all ive heard the computer will act as if it's in "open loop" (how the engine runs when at WOT) which could lead to poor gas mileage if the ratio's not correct. I dont know if the SN95's are any different but on my '89 I just got a code about the sensors (I had a feeling they were bad) and I've been getting about the same mileage- 12 mpg- all city- whether I'm on it all the time or not (actually, mine seems to get worse when I try to keep it under 1800 rpm & drive like a granny, maybe my tranny's letting it stall too much?) anyways hope you figure it out, I'll probly have to drive my POS Datsun if gas $ keeps going up.
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