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Old 05-09-2007, 10:24 AM   #1
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I have been shopping for a new truck. I have narrowed it down to a Ford F250 or a GMC 2500HD. I can't afford the diesel so the gassers are the way for me. On paper, the new GMC 6.0 L engine with the Variable cylinders of 4 and 8 looks to be better than the 5.4L engine in the F250. Plus the 6 speed transmission is better than Ford's 5 speed. Does anyone on this board have any experience with this new engine? I am interested in the real world mileage claims of 16 mpg city and 24 hwy (off another site). I know that this will change when towing, but unloaded mileage is a concern when I am not towing. I have heard nothing but good things about the new trucks, but I am not familiar with GM products.

Thank in advance.
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Old 05-09-2007, 10:24 AM   #2
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I have been shopping for a new truck. I have narrowed it down to a Ford F250 or a GMC 2500HD. I can't afford the diesel so the gassers are the way for me. On paper, the new GMC 6.0 L engine with the Variable cylinders of 4 and 8 looks to be better than the 5.4L engine in the F250. Plus the 6 speed transmission is better than Ford's 5 speed. Does anyone on this board have any experience with this new engine? I am interested in the real world mileage claims of 16 mpg city and 24 hwy (off another site). I know that this will change when towing, but unloaded mileage is a concern when I am not towing. I have heard nothing but good things about the new trucks, but I am not familiar with GM products.

Thank in advance.
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Old 05-09-2007, 07:00 PM   #3
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If your towing over 4000 lbs look at the 4:10 ratio , my dads 2001 GMC 6.0 crew cab 4x4 needed some RPM to pull hills ,it had 3.73 with 33" tires. he would only get 13 mpg driveing it really easy so I would expect maybe 14 or 15 out of the new combo.
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Old 05-16-2007, 10:03 PM   #4
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The 6.0L in the 2500HD is not the 4/8cyl model. My new rig (see sig) is getting 14 on the hy 12 in town and 9-10 towing. I have 2700 mi and it seems that ever since it hit 500mi it is getting better mileage with every tank. A lot depends on how heavy the old right foot is. I have the 4.1 rear end and in 6th gear 1800RPM = 60 MPH. BTW It will actually tow my 5600lb AF in 6th on the flat and down to 4th on a 6% grade - but doing 50-55MPH. Overall I am very happy with the truck.
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Old 07-25-2007, 04:54 PM   #5
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Whatever the mileage on the 6.0, it will probably be better the the Ford 5.4. The GM engine is rated 345 hp, I think, and the Ford 5.4 is 300. All in all, the GM gasser is probably a better package.
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