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Old 07-15-2011, 12:54 PM   #85
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It sounds like the new 2011 Duramax gets good MPG, but how much DEF does it use?

Dennis
Design intent is one tank per oil change as dictated by the oil life monitor. This could be slightly variable though.
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Old 07-17-2011, 07:31 PM   #86
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What I figured.
‪Uphill Chevrolet Silverado HD 3500 2500 Duramax vs Ford Superduty Scorpion Diesel Tow Comparison‬‏ - YouTube
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Old 07-17-2011, 08:14 PM   #87
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Real world!
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Old 07-18-2011, 01:03 AM   #88
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I would recomend KILLING the DPF and getting a real HP TQ jump.
flyingflinn is in CA and will be getting that diesel smogged like the gasers. He'll never pass without an unmodified emission system. Diesel emissions tests coming to all states real soon.
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Old 07-18-2011, 10:23 AM   #89
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Design intent is one tank per oil change as dictated by the oil life monitor. This could be slightly variable though.
Apologize for a newbie question: What is DEF? Thanks for helping with my education on diesel.
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Old 07-18-2011, 10:28 AM   #90
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Diesel exhaust fluid. Acts as a catylist in the exhaust stream to reduce pollutants. In 2011 going forward.
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Old 07-18-2011, 10:28 AM   #91
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Apologize for a newbie question: What is DEF? Thanks for helping with my education on diesel.
This years small diesel trucks have to have a urea injection system to aid in the reduction of emissions.
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Old 07-18-2011, 05:19 PM   #92
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Ah, Diesel Exhaust Fluid. So, this won't apply to out 2008 Duramax, then?
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Old 07-18-2011, 09:29 PM   #93
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Ah, Diesel Exhaust Fluid. So, this won't apply to out 2008 Duramax, then?
Nope.
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Old 08-13-2011, 10:10 AM   #94
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We took delivery of Fred, the truck (2011 Silverado 3500 Dmax) last week. We just drove Fred from Jacksonville to Santa Rosa Beach on US 90 at <55 mph for 320 miles. It was a long trip at that speed as we are still in the initial 500 mile break-in period. Fred got an impressive 21.1 mpg on this all day trip. He was traveling empty with just a driver.

Fred now has 485 miles under his belt, and I will soon see how he does at highway speeds towing Lucy.

Brian
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Old 08-13-2011, 01:32 PM   #95
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Sharp truck there Brian, a 1 ton getting 21mpg is impressive!
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Old 08-14-2011, 10:40 AM   #96
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Nice looking truck Brian. Certainly great mileage for a brand new one ton truck with an engine that is not broken in. It will be interesting to hear how Fred's mileage is when towing Lucy.

Dennis
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Old 08-15-2011, 10:44 AM   #97
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So far, I'm impressed with new truck. I'm anxious to see how he will do with Lucy in tow.

Brian
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Old 08-20-2011, 08:15 PM   #98
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Fred just completed his first tow of Lucy. He pulled her from Jacksonville to Tampa (200 miles) on both US 301 and I-75. Fred pulled at 60-65mph on 301 and 70-75mph on 75. The average mpg was 14.7. Here are a couple of shots of Fred and Lucy during a rest stop at Citra on 301.

Brian
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