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: Mileage 2002 K3500 Duramax vs 2003 K3500 6.0 BRWoodworking 05-06-2007, 10:14 AM What should I expect gas mileage to be in a k3500 with the following motors. The vehicles each have a utility bed and are dually's 6.6 Duramax with Allison 6.0 Gas 8.1 Gas pmeg1 05-06-2007, 04:29 PM What should I expect gas mileage to be in a k3500 with the following motors. The vehicles each have a utility bed and are dually's 6.6 Duramax with Allison 6.0 Gas 8.1 Gas I would guess 15 or so in mixed driving on the Dmax but wouldn't expect any more than 10 if that from the other two. | ||