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I really feel sorry for you driving in the UK. 75 mph tops?
I have driven my 07 compass to 120 mph several times in the freeways of California. so much fun !
As far as miles per gallon I average about 24 mpg (US) mixed driving.
 

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So anyway if I want to get great gas mileage here's what I do:
I use my cruise control a lot.
I don't stomp on the gas pedal.
I make sure my tire pressure is correct even adding 1 psi more than required. It won't do any harm.
I try to coast before stopping at the red light.
I try not to brake too hard. Remember that the gas you used to accelerate that vehicle is energy wasted as heat when you brake (assuming that you are driving on level ground. Worse when you are driving up an incline, free if you are going down)

Driving style affects mpg a lot.
 

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My previous Jeep was a 2011 V6 Grand Cherokee that got 17 MPG average. New 2019 Compass average is 26 MPG. So with gas currently around $4.00 a gallon here in CA I am not complaining too much if it is a little pokey.

Baja-D
 

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Discussion Starter #24
So anyway if I want to get great gas mileage here's what I do:
I use my cruise control a lot.
I don't stomp on the gas pedal.
I make sure my tire pressure is correct even adding 1 psi more than required. It won't do any harm.
I try to coast before stopping at the red light.
I try not to brake too hard. Remember that the gas you used to accelerate that vehicle is energy wasted as heat when you brake (assuming that you are driving on level ground. Worse when you are driving up an incline, free if you are going down)

Driving style affects mpg a lot.
yeah, I used to those things (including the ill-advised drafting behind a semi) back when gas prices peaked back in 2008 - a new term was coined: "hyper-miling". i certainly drive less aggressive than I used to.
 

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jeepney_driver said:
I use my cruise control a lot.
Cruise control probably works better in the older CVT or any of the manual trans Compasses, but its not worth a hoot with the 9 speed auto. Too much frequent downshifting on the highway when you encounter a hill, or a breeze, or bump into a fly with your windshield...

jeepney_driver said:
I try to coast before stopping at the red light.
I try not to brake too hard.
Good habits.

jeepney_driver said:
Driving style affects mpg a lot.
Very true but where you live has a lot of influence on how you must drive, many parts of the world have a slower pace of life than others. People who have to do a lot of 75 MPH freeway driving and merging on ramps don't have the luxury of putsing around to get better gas mileage.
 

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@jeepney_driver You don't need to copy/paste your posts of... wisdom... everywhere for us to see them. We all get the same list of active topics in the morning, we see all the new posts wherever they are.
 

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Cruise control probably works better in the older CVT or any of the manual trans Compasses, but its not worth a hoot with the 9 speed auto. Too much frequent downshifting on the highway when you encounter a hill, or a breeze, or bump into a fly with your windshield...
works just fine, i use it every day. sure it will downshift at times, all trans will
 

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mdram4x4 said:
works just fine, i use it every day. sure it will downshift at times, all trans will
I'd be willing to believe its a touch better in the Latitude and TH trims, since they have lower final drive gear ratios than the Limited trim, but either way its still going to downshift way more than a traditional 4 speed auto tied to a V6. There is simply not enough torque in the lower RPM range of the 2.4, combine that with really tall gearing in my Limited trim and piss-poor transmission programming and you get downshifts for every slight breeze and almost every hill.

If I put my roof rack and Thule cargo box on, the effect becomes nearly unbearable. You absolutely cannot use cruise control with this thing on a 70+ MPH highway with a large cargo box unless you stick it into manual/auto-stick mode. If you don't, it bounces between 7th and 8th gear non-stop for miles and miles on end, even if you are going downhill. Even if you aren't using cruise, the constant downshifts are a problem with the cargo box.

Am I exaggerating slightly? Absolutely. My frustration is not an exaggeration, however.

If I ever get my hands on some kind of tool that can tweak transmission parameters, I am going to set this thing to hold every gear longer and lock out 8th unless you are going at least 80 MPH. That would pretty much cure it. The tools exist for other FCA vehicles (hptuners mpvi2), they just haven't quite matured for the ZF9 yet, but they will and I will be waiting. One day there will be enough tools to poke and prod this half-baked car into a really good machine.
 

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I'm not surprised that certain trim levels and combos have poor programming since they offer 20+ combinations of engines, transmissions, and final drive ratios in the 2nd gen compass across the world. A few of those combinations are bound to slip through the cracks and not get the attention that they should have, vs something like the Chrysler 300 with only maybe 4 combos of engines and transmissions, there is enough time to allow the engineering department to get everything right on each variation there.
 

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I recently took a trip from NH to Virginia and back. Just my Wife & I and the usual complement of luggage. We were on interstates or state highways for the most part. Just a little city driving in a few cities. On the highways I drove just shy of the posted limits, i.e. mid-60s most of the way. I kept my transmission in 8 and on hills dropped it to 7, maybe 6 on a few of the steeper hills. In Virginia we spent 2 days on the Skyline Drive (beautiful) so only drove 30ish for about 100 miles with lots of ups & downs and of course we drove easy on that road with many stops to view the scenery. We averaged just over 34MPG for the overall trip (1600 miles). Doing the math and comparing to the EVIC the figures were just about identical. Most EVICs I've had in the past were very optimistic, but this one seems right on.
 

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I got 29mpg for a couple long trips that were over 3 hours one way. Normal driving I get 24-26mpg.
 

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UK 2.0lt 170bhp diesel 9 speed auto

On a run keeping below 70mph can average just about 51-53mpg

Mixture of town and motorway - typical commute to work 38-43mpg

Driving more around 80-100mph mid 30s mpg

Fastest I've had it 131mph on speedo which showed 126 on the u-connect GPS

Sent from my G8141 using Tapatalk
 

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UK 2.0lt 170bhp diesel 9 speed auto

On a run keeping below 70mph can average just about 51-53mpg

Mixture of town and motorway - typical commute to work 38-43mpg

Driving more around 80-100mph mid 30s mpg

Fastest I've had it 131mph on speedo which showed 126 on the u-connect GPS

Sent from my G8141 using Tapatalk
A quick reminder. US MPG and UK MPG are different since US gallon and UK gallon are different. So the values are not directly comparable. So a MPG of 40 for UK is about 33 for US.
 

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PS, according to my EVIC I've averaged 33.4MPG during my first 12,000 miles. I put the snow tires on this week and reset it. I know my fuel economy will drop because of the snow tires and of course lower temperatures as winter approaches.
 

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...I know my fuel economy will drop because of the snow tires and of course lower temperatures as winter approaches.
You left out winter-blend gasoline as a reason for your fuel economy drop during the winter months.


From What is the Difference between Summer- and Winter-Blend Gasoline?:
The US Environmental Protection Agency (EPA) says conventional summer-blend gasoline contains 1.7 percent more energy than winter-blend gas, which is one reason why gas mileage is slightly better in the summer.
 

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I get around 23 mpg overall. Highest I was able to get was 29 and driving very smoothly and carefully and using the cruise control a lot. (2007 jeep compass FWD)
 

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True.

I still think the tires make a huge difference, too. I'm talking about a 10% decrease.
Air resistance also makes a big difference.


Finally, a vehicles aerodynamic drag is proportional to air density. On a 70-degree-F day, the density of the air is 16 percent lower than on a day with temperatures around 0 degrees F. Although this makes little difference in urban driving, it could account for a highway mileage per gallon reduction of 7 percent on the colder day​

https://www.scientificamerican.com/article/why-is-the-fuel-economy-o/


This is a big factor for naturally aspirated prop planes. Good luck taking such a plane up into the air from a high elevation airport on a hot summer day. Not only there is very little air to generate lift, engine power is also lower due to thinner air.
 
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