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Old 09-24-2013, 12:42 PM   #11
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I've been getting about the same mileage on my 2013 Berkshire on our 7500 miles summer trip away from Texas. (a little less thru the Rockies) but great from Yellowstone back to Houston. I was told on the 6 speed Allison that 5th and 6th were both overdrive. We found you had to go up to about 65 to get it to drop into 6th but then could back off to about 61-62 with cruise control and it would stay in 6th.
Does your mode button work?? Mine was inoperative when I got the coach, but FL replaced the shifter box under warranty. Economy mode gives an extra .5 to 1 MPG.

Before I got the mode thing fixed, I couldn't get into sixth nor stay in sixth under about 68 MPH. Now I can stay in top gear all the way down to 58 or so.

BTW, on a 3 or 4 % uphill grade the instantaneous MPG will sometimes drop all the way down to 3-4 MPG. OUCH!!!! So if you did that well in the Rockies, you're in tall cotton.

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Old 09-24-2013, 01:03 PM   #12
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I've never used "economy mode" and don't know how to unless you're referring to manually changing the gear you're in. I might be able to drop to 58 in 6th but since I don't normally drive that slow I haven't tried that either.
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Old 09-24-2013, 01:07 PM   #13
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If you push the mode button, the trans will shift into 6th at about 62 mph. It will also not down shift as easily on some inclines as it would without the mode button on.
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Old 09-24-2013, 08:50 PM   #14
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I've never used "economy mode" and don't know how to unless you're referring to manually changing the gear you're in. I might be able to drop to 58 in 6th but since I don't normally drive that slow I haven't tried that either.

There is a button labeled "mode" on your shift box - mode being either "performance" or "economy". There's a small LED in the button and when illuminated the tranny is in "economy" mode. This changes the shift points so the tranny will tend to go into (or stay in) a higher gear at lower RPM's.

One thing to note if you decide to start using economy mode is that you can select it (so the light is on) but as soon as you shut down the engine, it will default back to performance mode next time you start the engine. So you have to select economy EVERY time you start the engine, assuming you want to use economy.

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Old 09-24-2013, 11:27 PM   #15
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Press the mode button when you are stopped or underway. When the light comes on you are in economy mode and I get an extra 1/2 MPG

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Old 09-25-2013, 10:20 AM   #16
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I have an 09 Charleston 40 ft coach, using economy mode going the speed limit plus a few pulling a Jeep Wrangler I get between 6.5 and 7 mpg. In Texas the speed limit is 70/75, so going down the road near 80 mph, smooth as can be. I'm not retired yet, so time matters to me, especially when I only have a week off to cover driving, relaxing, etc. We typically will do 400 miles a day max, going the speed limit saves us quite a bit of time each day to relax in the evenings. Perhaps if I ever get to retire I will see what it is like to slow down a bit....
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Old 09-25-2013, 05:07 PM   #17
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I have an 09 Charleston 40 ft coach, using economy mode going the speed limit plus a few pulling a Jeep Wrangler I get between 6.5 and 7 mpg. In Texas the speed limit is 70/75, so going down the road near 80 mph, smooth as can be. I'm not retired yet, so time matters to me, especially when I only have a week off to cover driving, relaxing, etc. We typically will do 400 miles a day max, going the speed limit saves us quite a bit of time each day to relax in the evenings. Perhaps if I ever get to retire I will see what it is like to slow down a bit....
Not trying to be s smart-butt, but an old buddy used to say of a "normal" vacation "We gotta hurry up and relax"!!

That's why I said earlier that it's all a matter of personal preference.

Oh, and retirement will come quicker than you think.

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