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2006 GMC Sierra 2500 HD 6.6L Poor Fuel Economy
I have a 2006 GMC K2500 6.6L Diesel with the Allison automatic trans. This started out getting 18 mpg. and 14 mpg. towing a fifth wheel camper. Now my mileage has dropped to 10.5 mpg. towing. This is on long trips of several hundred miles at a time. I have che...
Summary posted 10/15/2008
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| VIN | [No VIN Available] |
| Engine | 6.6 L / 8 cyl / DIESEL |
| Trans | 6-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | Poor Fuel Economy |
| Occurs | Always |
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Vehicle Data
2006 GMC Sierra 2500 HD
| VIN | [No VIN Available] |
| Engine | 6.6 L / 8 cyl / DIESEL |
| Trans | 6-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | Poor Fuel Economy |
| Occurs | Always |
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