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Originally Posted by Denis4x4  Just returned from a trip yesterday that included Slumgullion Pass and Wolf Creek pass pulling an '06 25' Safari FB with an '06 GMC 2500 crewcab with the 6.0 and 4:10 gears. Overall mileage was 11.2 MPG. On a recent trip from Durango to San Diego, I got 17.6 MPG using cruise control at 64 MPH. Over the course of 6 days, gas prices ranged fro $4.69 for unleaded in Lake City to $3.85 in Alamosa. Diesel was at least 75 cents to a dollar more. Last time I had my truck serviced, I noticed that there was an eight grand spread between a gas and diesel truck. | Not bad mileage for a 6.0 Chevy gasser in 2500hd clothing. They usually get 10 mpg just like the 8.1 in towing and 17-18 mpg not towing on highway. I see 14.9 mpg not towing on the highway with regularity at 68 mph and have broken 15 a number of times at 65 mph.
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Craig
AIR #0078
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system
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