GTV6 gas mileage

["Obie Fayth" <bibendum59@domain.elided>]

     I've just started noting the mpg I'm getting in my '83 gtv6 and it is 
horrible! On the first tank I averaged less than 12 mpg so I disconnected 
the O2 sensor to see what it would do. Now I'm getting 15 which is a great 
improvement, but it seems like it should still be able to do better than 
that. This is no twin-turbo 3.0 liter monster, just a mild mannered recently 
rebuilt stock 2.5l beast. Granted I only have a 7 mile round trip commute 
each day and seldom drive the car on weekends, but the ~12 mpg I get can't 
be good. If it is I might be looking at a Suburban for a commuter vehicle ;)
     Since disconnecting the O2 sensor leaned it out I'm assuming that the 
sensor must be bad. I have a replacement waiting to go in. I've checked the 
timing and the coolant temp sensor recently and they both checked out ok. 
What else should I check and how many miles/gal should I be getting around 
town? Also, I'm getting some light backfiring on deceleration. Would this 
due to the overly rich mixture?

thanks in advance,
-Obie
Tacoma, Wa.
assorted Alfas



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