Lower RPM to get better MPG - JeepForum.com

 
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post #1 of 10 Old 03-03-2008, 09:28 AM Thread Starter
goshawk99
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Lower RPM to get better MPG

Hi,
The wife just bought her new Compass about 8 weeks ago and I noticed that the so call mpg rated by the government is no where near it. Who really travels at their test speed. I did notice that when the tach is around 2000 I get better mpg. Could the rpm be alter so that when we are cruising at 65/70 we get the 2000 and not the 2800.
BTW it's an automatic 2.4l FWD.

Thanks

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post #2 of 10 Old 03-03-2008, 10:55 AM
JLink
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I have a 5 speed, but I get the best mpg at between 1800 - 2000 rpm. cruising speed of about 50 to 55.

--JLink (aka. JeepJim)
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post #3 of 10 Old 03-03-2008, 01:21 PM
eighteenwheeler
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the big mPG Question

Fear not!

I don't believe it's RPM- It's speed. I could do the research, but aerodynamically, the best gas mileage will come 55-60 miles per hour. Above 60, it's air resistance that gives the poor gas mileage. I know there is a lot of research with my other vehicles (such as my ford F150), as to what speeds, not RPMs...

it's tough to discuss the gas mileage aspect. For some odd reason, the cars get much much better gas mileage the longer you drive them. Now at 100 miles, I was getting like 16 MPG on my compass. Now at 10k miles on the car, I'm getting 30 miles per gallon on the highway easily... I know many other patriot/compass owners have said the same thing. You will get worse gas mileage at first, but you will get much better than stated gas mileage once you break that bad boy in!

AND i have a CVT automatic 4x4. the 4x2 should be that much better..

So yes... I believe the car should be rated higher MPG than stated. Don't be discouraged when it's lower at first.

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post #4 of 10 Old 03-03-2008, 01:56 PM
zxjockey
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I also have noticed that if I keep my foot out of it and hold her at 60ish, my mileage is fantastic. As I climb past that, it drops like a rock.
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post #5 of 10 Old 03-03-2008, 02:19 PM
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Quote:
Originally Posted by zxjockey View Post
I also have noticed that if I keep my foot out of it and hold her at 60ish, my mileage is fantastic. As I climb past that, it drops like a rock.
I hope I can get my '07 Compass 4X4 up to about the rated 26 on the highway. Most of my driving is freeway driving. The problem with doing 60ish is that I would get ran over by a Yugo or flattened by all the big rigs on my daily commute. I have to do at least 70, so I hope with a CAI and maybe exhaust and after some miles I can get to that point. I could live with 26mpg

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post #6 of 10 Old 03-03-2008, 05:20 PM
Jeepster55
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i got 26 MPG on our trip to KC last November, after only having it a week or so. the first thing i noticed is that if you take off and hold the RPM's at 2000, your speed keeps increasing even though the engine speed remains constant. eventually you 'top out', but this is how i was driving on the interstate and did really well. i think the next trip we take, with some miles on it now, we'll do even BETTER!
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post #7 of 10 Old 03-03-2008, 07:33 PM
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For the first 1,100 miles I have averaged 24.1 mpg with my Compass 4x4 CVT. My commute is about 60 miles a day, mostly interstate but with about 4,500 feet of elevation change. I keep it about 58 - 60 mph- if you want to get the mileage you have to slow down. I know there are many people out there that b***h about the gas prices, but drive 70 -80 mph- they do not understand that aerodynamic drag increases with the square of the speed- double the speed and quadruple the drag. I figure will be able to better the EPA numbers on a steady highway trip.

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post #8 of 10 Old 03-03-2008, 08:08 PM
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Quote:
Originally Posted by jbjeepguy View Post
For the first 1,100 miles I have averaged 24.1 mpg with my Compass 4x4 CVT. My commute is about 60 miles a day, mostly interstate but with about 4,500 feet of elevation change. I keep it about 58 - 60 mph- if you want to get the mileage you have to slow down. I know there are many people out there that b***h about the gas prices, but drive 70 -80 mph- they do not understand that aerodynamic drag increases with the square of the speed- double the speed and quadruple the drag. I figure will be able to better the EPA numbers on a steady highway trip.
excellent post!

yes, it's always been the 'smart' thing to do.....go slower and get BETTER mpg's, but who said Americans were 'smart'! until gas hit $3+/gal, we only wanted to get where we were going FAST and the cost of gas was secondary. now it's a different story......
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post #9 of 10 Old 03-04-2008, 05:26 AM Thread Starter
goshawk99
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Thanks for this interesting discussion. Like it or not... long distance driving on highways are boring and the sooner I get to my destination the better and I guess better mileage will come as the compass is broken in.
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post #10 of 10 Old 03-04-2008, 07:13 PM
CoriolisSTORM
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Quote:
Originally Posted by goshawk99 View Post
Thanks for this interesting discussion. Like it or not... long distance driving on highways are boring and the sooner I get to my destination the better and I guess better mileage will come as the compass is broken in.
Very true, I stomp the EPA numbers of 26 MPG highway (that's the old rating though, I really beat the new one!) on my R/T FWD Caliber w/ CVT II. Normally on the highway at 70 or so is 28-30 MPG, had a couple of 32 MPG tanks and a 36 MPG one time! (But that was straight 55 the whole way, no A/C or anything on the highway.)

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