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Q: Poor gas mileage on 2005 Chevrolet Express 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
What do I do to find out how to address the problem?
(1) Answer
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