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10.5 mpg in my 6.5L detroit
hello diesel guys. I just bought this gmc 6.5L with my truck camper in the back went for a road trip about 350 miles from Chicago to cave in rock IL right by the ohio river. on the way there I got 10.5 mpg now this is just unacceptable for a diesel. a gas 350 ... Login to read more. 
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39 Replies Received
39 Replies Received
| Engine | 6.5 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1995 GMC K2500 Sierra SLT 6.5L
| Engine | 6.5 L |
| Trans | 4-speed Automatic (Electronic) |
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