Another MPG thread - 2500 mile mark - V6 TH - 2014+ Jeep Cherokee Forums
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post #1 of 30 (permalink) Old 03-09-2017, 10:29 AM Thread Starter
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Another MPG thread - 2500 mile mark - V6 TH

I know we beat this dead horse enough, but I've just realized a definite improvement. My last fill up was after I passed the 2,500 mile mark. It was over 1.5 mpg better than what I've seen prior. I had been doing good to see an actual 19 mpg. Many tanks were high 18.x mpg despite how much highway miles were in my mixed cycle. Just a few were around 19.5. Then last night's fill up netted 20.9 mpg. Same right foot, same daily routine, but it's clearly improved. I was curious if anyone else has seen an improvement that's hard to explain. I wonder if the ECM changed at the 2500 mile mark. Like some kind of break-in programming ending.

The weather was warmer for many days, but our entire winter has been mild. This morning, my avg mpg by the time I got to work was 21.8 mpg indicated. I always fill up at night and go straight home about two miles away, then drive to work the next morning. Normally, it would indicate 19.x after the same two drives immediately after a fill up.

I also noticed higher current mpg values at various points during my highway portion this morning. I suspect this tank will mimic the last one. If it will now hover between 20-21 mpg rather than 18-19, my only disappointment in the vehicle will be erased. The first several tanks barely able to do 1 mpg better than the city rating was a major letdown.

Also worth noting, what has remained consistent over the last several fill ups is my EVIC avg mpg is 0.8 to 0.9 higher than actual. It was nice to see it remain consistent even with the improved gas mileage.

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post #2 of 30 (permalink) Old 03-09-2017, 11:15 AM
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I have roughly 3500 miles on mine. This winter, my MPGs dropped to between 12 and 15, from 18 to 20 last summer and fall. Now that it is warming up, I'm beginning to achieve 18 to 20 again. It got cold again last week and dropped back to 15 to 17. The only thing I can attribute to this is that the transmission holds gears longer to help warm the car faster. I have the cold weather package and tried the remote start 2x just to see if it worked! I never warm up my Jeep.
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post #3 of 30 (permalink) Old 03-09-2017, 04:14 PM
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I've been tracking my mileage for 3 years (almost to the day) and the mileage has varied wildly. It's been as low as 12.9 (winter fuel) and as high as 25.9 (summer, mostly freeway). There is a huge drop in winter as the TH seems to hold gears longer before warming up, just as @dhh3 mentioned above. Not to mention the crappy winter fuel they use around here.

In almost 20,000 miles and 943 gallons of gas, my overall combined MPG is 20.105 (calculated) and using the MPG meter on the EVIC, the MPG is 20.828. This is about a 3% difference between the two readings. I never noticed that there was a dramatic increase in MPG as the engine broke in. As long as it's going up, you should be happy.
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post #4 of 30 (permalink) Old 03-09-2017, 04:24 PM
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@04Freedom ;

Yes putting some miles on it helps. In your specific case, with those numbers though, I suspect outside temps above 40F being very helpful. Possibly tailwinds too but you would be aware of those I suppose.

EVIC seems pretty consistent at or near 1 mpg over calculated/real.
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post #5 of 30 (permalink) Old 03-09-2017, 08:23 PM Thread Starter
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I'd estimate 1/3 or less of my driving has been in wet or <40F conditions. If the temp threshold was 45-50F, I'd say the Auto/4WD was the reason for a nice increase thanks to warmer weather.

I guess I get to revisit this next fall/winter assuming this increase isn't a fluke.
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post #6 of 30 (permalink) Old 03-10-2017, 08:11 AM
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Many things go into mpg. Most of which have been covered over and over again.
The one thing that is not talked about much in this area with the Cherokee is the transmission.
That is the use of 8th gear on the highway. There is an AL component to the use of 8th.
Mine took 3,000 miles initially to begin to use 8th. It would not get out of 7th. when I started using 8th I got into 30-33 range on mpg highway depending on average speed.
When I got a TCM/PCM update in May of 2015 (the only one I have had) I lost 8th for about 1,000 miles after that update. If I hit 29 mpg highway I was lucky.
So the consistent use of 8th is huge in the mpg category.
With this last update the transmission will now go into 8th at 57/58 mph. In fact it will stay in 8th as low as 55 mph depending on grade.
The mpg gain in this 57/58 range is huge, especially if it maintains it at 55mph. Rpms in 8th will range from just under 1500 in the 55/58mph to 1700 at 70mph.
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post #7 of 30 (permalink) Old 03-10-2017, 08:27 AM
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Quote:
Originally Posted by Jeepster1 View Post
Many things go into mpg. Most of which have been covered over and over again.
The one thing that is not talked about much in this area with the Cherokee is the transmission.
That is the use of 8th gear on the highway. There is an AL component to the use of 8th.
Mine took 3,000 miles initially to begin to use 8th. It would not get out of 7th. when I started using 8th I got into 30-33 range on mpg highway depending on average speed.
When I got a TCM/PCM update in May of 2015 (the only one I have had) I lost 8th for about 1,000 miles after that update. If I hit 29 mpg highway I was lucky.
So the consistent use of 8th is huge in the mpg category.
With this last update the transmission will now go into 8th at 57/58 mph. In fact it will stay in 8th as low as 55 mph depending on grade.
The mpg gain in this 57/58 range is huge, especially if it maintains it at 55mph. Rpms in 8th will range from just under 1500 in the 55/58mph to 1700 at 70mph.
Yep, I've been saying this about 8th a lot too.

I posted in another thread about a trip we did last week, with nasty headwinds on the first leg and half thte return leg. Could not get into 8th, even at 60-65 mph, and mpgs suffered accordingly. On the way up we had above freezing temps, but still just below 40F. And a roof cargo box. We got about 18.5 mpgs which is a record low for me in the KL. But still, I've done these winter trips before and with no winds I had no problems getting into 8th, even at 5F or whatever. On the way back with colder temps adn no wind for half the distance, we got 23mpgs with quite a bit of 8th gear. In summer with a slight tailwind and similar cargo, I've gotten 28mpgs.
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post #8 of 30 (permalink) Old 03-10-2017, 09:49 AM
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Love my KL, but sure miss the ability to "manually" shift gears up and down like I did with the Optima. I still have a tendency to try and do it still out of habit. I know the KL is a totally different vehicle, transmission and larger motor etc, but sure miss that availability. I really think I would have more control over my mileage and performance especially with trips up and down the mountain. Sure seemed like it with the Optima. It was until after I got the KL and became educated about things that I realized it (manual shifting) isn't/wasn't going to happen lol. May be just me, but sure seemed a lot better when "I" had control, but realize these transmissions are programmed etc.

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post #9 of 30 (permalink) Old 03-10-2017, 09:52 AM
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Another thing not mentioned is that the tire pressures can affect mileage too. When it's cold, a tire looses pressure and increases rolling resistance. This is why I am constantly adjusting my tire pressure per season...
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post #10 of 30 (permalink) Old 03-10-2017, 10:16 AM
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Quote:
Originally Posted by mults View Post
Another thing not mentioned is that the tire pressures can affect mileage too. When it's cold, a tire looses pressure and increases rolling resistance. This is why I am constantly adjusting my tire pressure per season...
Agreed! This is a real pain for me living in the Sierra Nevada Mountains where temps get really cold then a trip off the mountain to warmer climate creates a lot of pressure changes. I've had low tire pressure warnings in the mornings and it usually goes off by the time it warms up or I go down the hill. It I top them off cold by the time I'm off the hill they are over inflated at times, so it's a constant juggle. Just try to find the happy medium. Mileage and tire wear come to mind.

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