Chevrolet Repair: bad gas miliage, chev 350, gas miliage

Question
i havce a 1995 chev 350 fuel inj conversation van,and getting 10 mi per gal city and 14 on open hwy

Answer
Hey,

 They don't get the best of mileage to begin with but that seems a little low.  I would check the spark plugs and filters.  Make sure the oxygen sensor is working efficiently and sweeps from .3v-.7.  A fresh set of plugs and new 02 sensor might make a world of difference.

Wayne