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Old 02-16-2009, 06:39 PM
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Question about driving the 6 speed manual

This is the first vehicle I have had that is 6 speeds. Is ok ok to drive on the highway in 5th? I find myself forgetting there are 6 speeds. Also I often find the need to down shift when I finally get there. Is there any stress on the engine driving in 5th at reletivelly low speeds, 70 max. I realize the gas mileage will suffer.
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Old 02-16-2009, 06:47 PM   #2
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Quote:
Originally Posted by bjhester View Post
This is the first vehicle I have had that is 6 speeds. Is ok ok to drive on the highway in 5th? I find myself forgetting there are 6 speeds. Also I often find the need to down shift when I finally get there. Is there any stress on the engine driving in 5th at reletivelly low speeds, 70 max. I realize the gas mileage will suffer.
No, it won't hurt it as long as you're not running exorbitantly high RPM's (above 3800-4000) for long periods of time.

In fact you might get better gas mileage under some conditions, as the most efficient part of the powerband is not necessarily the lowest possible point on the tachometer (especially when you're considering working under load, like uphill or into wind)

Good rule of thumb: Keep the engine at a point in the powerband where you can maintain a constant speed regardless of wind or incline. If you're going full throttle in 6th gear to maintain a speed, you will probably get better mileage if you shift to 5th and go at a bit higher RPM and less throttle.

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Old 02-16-2009, 08:10 PM   #3
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Around here I VERY rarely get to go to 6th . 70 mph in 6th is just 2000 rmp (no torque at that rmp)
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Old 02-16-2009, 10:31 PM   #4
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I got used to upshifting into 5th or even 6th speed around town and am getting amazing city fuel economy --shy of 20 mpg.

However, what everyone said before about no torque is true.

Just play with gears and leave it wherever you feel the Jeep is most happy.
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Old 02-18-2009, 03:26 PM   #5
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There is defiinitely no torque with the low RPM's but driving in a lower gear is not a big deal. I have a few other cars that I take to the race track and daily drive and they are always getting wound out to high RPM's. One of the cars was daily driven since new like this and it has 92,000 miles on it now and the other has 141,000 miles. Still running strong.
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Old 02-19-2009, 08:14 PM   #6
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Look at your tachometer as you drive, and watch that "power-band" described above. You'll get used to the sound and feel and eventually you won't need to look at the tach. I use 6th mostly when I am on long straight aways at 55+ mph. I am averaging 19-20 mpg right now with 3/4 of it "city" driving.
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Old 03-10-2009, 03:41 PM   #7
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dewayne: you shouldn't be anywhere near 5th or 6th gear travelling in areas like you have shown in that picture

When I go camping with my 8X10 covered trailer, loaded near the limit of 3000, I'm lucky to get out of 4th on some terrain. Gas mileage goes down to as low as 9mpg in some of the hilly terrain that I have had it on. On hills with 3K lbs behind, it takes some doing to get it to go. I totally agree about keeping it within the power band especially under work load.

On highway driving with no load, and even in the city on flat surfaces I'm in 6th at around 40. If I need get up and go, I'll punch down a couple-a-few gears and git on it. She responds nicely. If you bought it to be a drag queen, you got the wrong vehicle. I have heard people say that it is underpowered in many posts. Mine won't beat a Camaro or Corvette off the stop but it sure is fun sometimes surprising them in a short passing distance and jumping in front of them. Mine ain't sluggish, just got to treat it right. She responds right nicely when talked to convincingly and all. I think it is all in what you want. I wanted a vehicle that can get off the beaten path. It sure does do that.
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Old 03-17-2009, 09:53 PM   #8
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The next time you drive an automatic in cruise control, listen and feel as you approach an incline on the interstate or road. The auto will down shift to keep the speed up. Same deal with a manual transmission, only you're controlling the gears. You will get more familiar with the "power band" the more you drive. If you have to down shift, go for it.

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