Re: Test drove a 2012 Long Horn diesel........gas mileage?
[Re: ahy]
#2326606
06/25/17 09:44 PM
06/25/17 09:44 PM
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Joined: May 2004
Posts: 12,476 Taxes & Virus's R-US, NY
Dragula
OP
I Live Here
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OP
I Live Here
Joined: May 2004
Posts: 12,476
Taxes & Virus's R-US, NY
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That is in the ballpark for town driving or moderate towing. I would expect a bit better on the highway w/o trailer. My 03 gets 17.8! Why would anyone want worse mileage?
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Re: Test drove a 2012 Long Horn diesel........gas mileage?
[Re: Dragula]
#2327428
06/27/17 10:38 AM
06/27/17 10:38 AM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Yup. When the 6.7 came out, mileage was crap. Took them a few years to figure out how to get it back.
**Photobucket sucks**
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Re: Test drove a 2012 Long Horn diesel........gas mileage?
[Re: Dragula]
#2327810
06/28/17 12:10 AM
06/28/17 12:10 AM
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Joined: May 2003
Posts: 13,226 aZLiViN
J_BODY
I Live Here
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I Live Here
Joined: May 2003
Posts: 13,226
aZLiViN
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EGR valve, lots of soot to turn into ash = lots of regeneration time which eats fuel.
an interesting side note on the early 6.7's (7-12). Lots of people bought these truck and when used in light duty driving (no load) it wasn't uncommon for the "change oil" indicator to come on early.... like 3/3.5K miles. Well....no diesel guy is going to let some light come on and tell him to change oil, "my old Cummins I went 7k on oil changes"... so on they would drive. When the system goes into regen, there is an injection event on the exhaust stroke to heat up the cats and dpf. Of course, this process also gets fuel past the rings (thus the jet black oil on these trucks) and the ecm calculates through drive cycles etc that when the crankcase becomes 2%-3% diluted, turn the "change oil" light on. So now our oil level has become WAY overfull, hits the crankshaft, coats the cylinder walls with thin diluted oil, gets past the rings, gets burned, creates more soot, goes into regen more, used more fuel..... and the snowball from soot he77 rolls hard.
I've honestly found many of these trucks "unfixable" based solely on driving habits and use. "IF" someone bought one of these trucks, and worked the L out of it, chances are I wouldn't see them except for service.
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