More MPG confussion

[sharpsicle]

Seems odd to me that after driving a vehicle for over 1000 miles the engine is still "breaking in" and gets terrible gas mileage because its still "breaking in". If this is true than its a terrible design imo. I highly doubt this has much to do with it though and even if it did we are talkin maybe 1-2mpg improvement. While driving, my cluster shows anywhere from 19-40mpg 95% of the time (when not accelerating from a stop). I have watched this while driving for the last 7 days and its pretty consistent between this range. However, the average displays between 12-13.5mpg. I feel like the average its displaying is wrong.

Wait, you aren’t hand calculating? Do that first and you’ll know for sure what your mileage is. What the screen shows is less relevant than what’s actually going into the truck.

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[Jeeper44mag]

How are people driving their rubis to get good gas mileage in the city? I’m seeing 14 mpg. Mine is used with 80k. Any tips would be greatly appreciated! Id love to see 17-18 avg tho.

Stock 2020 JTR, 3.6L gas w/auto, ~31k miles atm. This was ~1/2 highway, 1/2 city, VERY easy on the throttle, not exceeding 60 mph. I had just filled up at the station... had just over 1/2 tank left according to the gas gauge when I refilled.

Luis

 

[Swordfish44]

Wait, you aren’t hand calculating? Do that first and you’ll know for sure what your mileage is. What the screen shows is less relevant than what’s actually going into the truck.

I guess i should do that. Lol. I didnt think the jeeps computer would be that much different than what i would calculate. But judging by your response it might be?

 

[sharpsicle]

I guess i should do that. Lol. I didnt think the jeeps computer would be that much different than what i would calculate. But judging by your response it might be?

I mean, if you think it’s wrong, then it’s time to find out for sure.

 

[Glad23]

your wife's jeep is geared 3.73 and your Mojave is 4.10. That will account for a difference in gas mileage.

 

[Ryan...]

I guess i should do that. Lol. I didnt think the jeeps computer would be that much different than what i would calculate. But judging by your response it might be?

Some are, some aren't. Mine has always been extremely accurate, typically within 0.5 mpg of my hand calculations.

PS. Today was my first trip with the new 35s driving into a direct winter headwind for 40+ miles.

15.1 MPG

 

[Jeeper44mag]

Yeah, the faster you're going, the more a headwind seriously affects your mileage. Essentially, a 15 mph headwind makes your mileage the same at 60 mph as if you were doing 75 mph. That's a HUGE difference when your vehicle has all the aerodynamics of a shoebox.

 

[Kevin_D]

Wait, you aren’t hand calculating? Do that first and you’ll know for sure what your mileage is. What the screen shows is less relevant than what’s actually going into the truck.

Actually, if you've corrected you speedometer/odometer, the truck's calculations will be more accurate than hand calculations.
You'll have a hard time filling up to the exact level every time: pump differences & temperature differences will cause the fill level to vary.
The truck knows precisely how much fuel it's used, and, with an accurate speedometer/odometer, the MPG calculation will be accurate.

Kevin

 

[sharpsicle]

Actually, if you've corrected you speedometer/odometer, the truck's calculations will be more accurate than hand calculations.
You'll have a hard time filling up to the exact level every time: pump differences & temperature differences will cause the fill level to vary.
The truck knows precisely how much fuel it's used, and, with an accurate speedometer/odometer, the MPG calculation will be accurate.

Kevin

Not if the truck is calculating it incorrectly, which is what he believes is happening. This is a troubleshooting recommendation. If he finds the truck is in-line with hand-calculations, we move on.

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