Poor gas mileage on 2005 Chevrolet Express 1500

What do I do to find out how to address the problem?

by in Mandan, ND on January 16, 2011
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1 answer
ANSWER by , January 16, 2011
Get a diagnostic. A good tech will see why is the air-fuel mixture is rich when monitoring the live data. Could be a simple thing like a stuck open thermostat. Zee