
in my Tahoe 08, I recently changed the connector and wires, I installed some medium range Iridium (NGK) connectors and connected these wires. The 'average' fuel economy calculated on the dash is a very long 13.9mpg, a mix of city and highway driving. I changed plugs and cables and reset the MPG average, over the course of 10 days my average is 14.8. I haven't done anything to the car other than installing these wires and a new connector.

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