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Old 04-06-2014, 03:26 PM   #57
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I also utilize the tach, I see way less shifting on the interstate with my Cummins at about 1725 rpm, which depending on terrain is somewhere between 64-67 mph, I also lose way less speed on inclines at this rpm than at 1500 rpm.
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Old 04-06-2014, 05:04 PM   #58
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At the shape some of these highways are in,I wouldn't want to go any faster.Here in Texas I-20 is so crowed it's a nightmare to drive on it,and the last time I went down I-10 the road was really bad.
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Old 04-06-2014, 05:25 PM   #59
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I worked for a company that 59mph was top speed for any vehicle we drove. The company saved on fuel, plus reduced the number of accidents per year. So now 60-65 is just fine for me, and my rv.
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Old 04-06-2014, 06:25 PM   #60
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We run 72 mph when road and traffic conditions allow, seems to be the sweet spot for the ISX. When the traffic gets heavy or the road is bad, we slow it on down.
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Old 04-06-2014, 06:44 PM   #61
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55 on two lane roads and 60 to 65 most of the time on interstates. It seems to like between 58 and 63 the best. Do not pull a toad. I try not to rush. Rushing is expensive. Pushing with right foot seems to flatten the wallet.
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Old 04-06-2014, 07:06 PM   #62
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Quote:
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60 seems to be the sweet spot for my rig.
Same here, plus I get "reasonable" mileage.
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Old 04-06-2014, 07:24 PM   #63
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62 to 67 keep's it under 2000 rpm , I try and stay at 1900 rpm @ 64 to 65 mph, for best fuel burn @ 11 mph towing my jetta
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Old 04-06-2014, 07:42 PM   #64
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65 for me on the interstates. Seems like it takes forever to get where I am going......
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Old 04-06-2014, 07:53 PM   #65
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We go with the flow to a max of 55-60 in the right lane. I don't feel comfortable pushing more than that with the fiver and mileage goes south in a hurry. If am holding up traffic I will look for a pullout and have lunch. I'm on vacation, I'll worry about meeting a schedule the other 49 weeks of the year.
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Old 04-06-2014, 07:59 PM   #66
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My week is comprised of six Saturdays and one Sunday so I set the cruise control, towing or not to 62-65 and use the tow haul setting to help conmtrol speed on down hill runs and limit the travel day to 6 to 6 1/2 hours per day.
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Old 04-06-2014, 08:02 PM   #67
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At the shape some of these highways are in,I wouldn't want to go any faster.Here in Texas I-20 is so crowed it's a nightmare to drive on it,and the last time I went down I-10 the road was really bad.
What part of I-10 is bad?
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Old 04-06-2014, 09:53 PM   #68
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55-60 mph, and that's only because my bus conversion has a 4 speed Allison transmission and the engine is pretty much wound out at that speed (2K rpm).

Actually, I'd still only drive that fast even if I COULD go much faster. 29,000 lbs and 35 feet of coach seems safer at 55 than at 75.
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Old 04-06-2014, 10:06 PM   #69
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53-55mph and am enjoying my 11-12mpg.
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Old 04-06-2014, 10:35 PM   #70
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59 mph, or 58 if it's windy.
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