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Old 08-07-2016, 09:42 PM   #81
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My olds 88 would eat injection pumps I finally got rid of it when I had problems with the top end. Never got any help from GM.
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Old 08-08-2016, 11:25 AM   #82
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Question to the group....
What is a good speed/rpm to maintain while cruising down the Interstate to get the best gas mileage??? I have seen a lot of various answers on this topic. I have a 2012 Ram 3500 that has been stripped of all the EGR stuff and updated with a tuned chip with 5 programs. I pull a 2013 Forrest River Viper XLR Toy Hauler. I have tried every speed from 60 - 70 and can not find a good setting that produces decent MPG's.
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Old 08-08-2016, 11:38 AM   #83
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Originally Posted by dgibbs1955 View Post
Question to the group....
What is a good speed/rpm to maintain while cruising down the Interstate to get the best gas mileage??? I have seen a lot of various answers on this topic. I have a 2012 Ram 3500 that has been stripped of all the EGR stuff and updated with a tuned chip with 5 programs. I pull a 2013 Forrest River Viper XLR Toy Hauler. I have tried every speed from 60 - 70 and can not find a good setting that produces decent MPG's.
Now that's a can of worms!!!! It just depends on your setup. For my duramax, it's anything under 1900 rpm. I probably do best at 65 to 68 mph, but I always run 70 so I don't have to pass/be passed by a lot of semis. Not a whole lot of difference in mpg. I usually avg 11mpg towing over a long trip.The 'how slow can I go' group will say to run 55. If you have already tried a speed range of 60 to 70 I'd say you've got what the you've got as far as mpg.
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Old 08-08-2016, 01:14 PM   #84
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I have a Silverado 3500 diesel and my best mpg is at 63mph. I get passed a lot


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Old 08-08-2016, 01:17 PM   #85
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my input probably doesn't matter much for your situation because I'm using a gasoline TV. However most of our travels happen in Utah, highway speeds are 80mph in most places so semis blow bye me all the time, I stick to 60-65. Anything more I get down around 10mpg
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Old 08-08-2016, 02:49 PM   #86
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My brother had an early 80s vintage Isuzu diesel pickup. I'd wager a bigger POS than those Olds diesels?


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Old 08-08-2016, 03:44 PM   #87
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Quote:
Originally Posted by dgibbs1955 View Post
Question to the group....
What is a good speed/rpm to maintain while cruising down the Interstate to get the best gas mileage??? I have seen a lot of various answers on this topic. I have a 2012 Ram 3500 that has been stripped of all the EGR stuff and updated with a tuned chip with 5 programs. I pull a 2013 Forrest River Viper XLR Toy Hauler. I have tried every speed from 60 - 70 and can not find a good setting that produces decent MPG's.
Lots of variables on this, but my particular truck / trailer seems the happiest at about 70, which is about 1600 RPM. It will climb most grades at that too, save for the longer and steepest grades.

MPG... I have seen between 11 and 13 from this rig driving at 70 with the cruise set.
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Old 08-09-2016, 11:50 AM   #88
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Just to get the facts, not debate politics: do you have a source for the claim that the Prius and other hybrid and batter electric vehicles produce more carbon over their whole lifecycle?

Here's a recent report from the Union of Concerned Scientists: Life Cycle Electric Vehicle Emissions (2015) | Union of Concerned Scientists.

Summary: "the Union of Concerned Scientists undertook a comprehensive, two-year review of the climate emissions from vehicle production, operation, and disposal. We found that battery electric cars generate half the emissions of the average comparable gasoline car, even when pollution from battery manufacturing is accounted for."

Of course, no one makes a Prius or Volt, etc. that can come close to towing a TT! So, back to topic: pulling uphill in cruise. Last month, I got nervous going 55 near the top of Willamette Pass in Oregon as I saw the tranny temp going well into the 200's. I pulled over at a viewpoint and let the engine cool a bit. No warning lights or anything, just feeling that we were pushing our 2010 Avalanche 1500 (gas) too hard. Was I too conservative? I saw a tranny temp discussion here a while back but it was outdated. Any wisdom?
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Old 08-09-2016, 11:56 AM   #89
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Upgrade to an external trans cooler.


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Old 08-09-2016, 12:16 PM   #90
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Best economy from 60-70 mph? Physics pretty much demands that to be 60mph, especially with a high top-flat rear door toyhauler. Assuming the truck is in the highest gear at 60 mph, you always will get the best mpg when the car-truck-train-spaceship-whatever is in the highest gear with the torque converter locked up and going the lowest speed possible to maintain that condition. It's all about aerodynamic drag at highway speed.
More on topic, I had a 2005 Duramax that seemed more then willing to try and self destruct on big grades towing big loads. Would it have? I don't know, but seeing the EGT and transmission temp climbing like that while passing semis made me back off before finding out. They should have EGT gauges standard on every diesel from the factory. It also can help with fuel economy because as that thing climbs the economy goes off a cliff.
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