Fuel Gauge Accuracy?

[JLUR Farout]

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[jeepoch]

@JLUR Farout

M, I call this the Lie-O-Meter. It's there just to give you a rough reference. The 'Distance to Empty' range value can only extrapolate distance based on current mileage. It can in no way accurately predict all the factors that will actually contribute to future mileage conditions.

You'd be foolish to trust the range indicator and drive it completely down to zero. That is unless you're driving downhill the entire way.

So use it at your own peril, but given your current mileage conditions, if all things stay the same, the Lie-O-Meter gives a good approximation. But no better.

Jay

 

[Mgg253]

Topping off can also trigger the vapor reuptake on pretty much all modern gas pumps. Essentially you may be paying for some of the next persons gas

 

[Sparty]

 

[Spank]

@JLUR Farout

M, I call this the Lie-O-Meter. It's there just to give you a rough reference. The 'Distance to Empty' range value can only extrapolate distance based on current mileage. It can in no way accurately predict all the factors that will actually contribute to future mileage conditions.

You'd be foolish to trust the range indicator and drive it completely down to zero. That is unless you're driving downhill the entire way.

So use it at your own peril, but given your current mileage conditions, if all things stay the same, the Lie-O-Meter gives a good approximation. But no better.

Jay

Not to mention if you're parked on an incline and your fuel is resting on one side of the tank, your fuel gauge will deplete, then magically return once you're level. This is by no means exclusive to Jeep, but it does end up messing with mileage and DTE calculations until you fill up the tank again.

 

[JLUR Farout]

Not to mention if you're parked on an incline and your fuel is resting on one side of the tank, your fuel gauge will deplete, then magically return once you're level. This is by no means exclusive to Jeep, but it does end up messing with mileage and DTE calculations until you fill up the tank again.

This particular Shell and pump I was at was inclined forward and sloped passenger, so the fill port is the highest part. Another station I go to is inclined forward but not sloped to the side. I always try to get my nose down...have in every vehicle I've owned where the tank is 'downstream' of the fill port.

 

[BCTrails4x4]

Greetings,

Question for the masses. How accurate is your current MPG reading and your fuel gauge? I have found that when towing, it is within 0.5 MPGs. When driving normally, it depends on how it is feeling...more IRS like or more charity like...drives the dash readout. Here are pictures. I took one just before the fuel station because I was on level ground and the pumps are inclined and I wanted a true read. I put 14.215 gallons in (3.0L diesel so 18.3 gallon tank). You can see the distance left...which is a crock. Dash said 24.3 MPGs but hand calculated is 21.646 on 307.7 miles. This was three days of commuting plus one trip to the gym. I track everything in Excel and there has been as much as a 5 MPG difference. I always top it off...playing the foam game until there isn't any so I always get a true read...facing down hill at the pump.

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In your photos, I notice the efficiency gauge(green line) accelerates from left to right with 0 as a starting point. I’m curious, did Jeep change this in the 2024? I have the 2024 Jeep Willys and my green efficiency gauge accelerates backwards with 99 as my starting point(and it accelerates right to left unlike yours).
As for your question on accuracy, mine fluctuated the other day. It told me I had 140kms left in the tank, by the time I got to work, which is only about 24kms, it then read 112kms left. Then by the time I got off work and warmed the engine before driving away, it read 150kms left in the tank. All within level driving, but like you mentioned with the incline, all those turns may have sloshed my fuel around and was getting inaccurate readings? Dunno seems strange, my Golf R never had this occur with fluctuations.
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[JLUR Farout]

Unsure. I had a 2018 JK and now this 2023 JL. If there is a setting to alter the MPG readout, I am not sure how to do it.

 

[JimWPB]

Topping off can also trigger the vapor reuptake on pretty much all modern gas pumps. Essentially you may be paying for some of the next persons gas

Please explain. I don't understand how this system works & I don't understand how you would be paying for the next guy's fuel.

 

[JINO]

I hand calculate, it's not far off.
Hand calculated, I'm getting 24.8. The computer tells me 25.3
So whatever it says on the dash, I think of it as 0.5 to 1 MPG less.
Taught my wife to do it too.
Her chevy cruze is getting 40+ mpg, 2.0 turbo diesel, her dash read a lot lower, showing high 20s, I think maybe sensors are bad. It's 10 years old, and I'm surprised there isn't more issues.

Another thing that puzzled me, my last jeep was also ecodiesel. It came with a banks kit, I pit 37s on it, was getting about 23 mpg (hand calc). Some told me diesels are far more efficient with extra weight. Not sure if that's true, but proof is in the pudding.

I have 38s now, waiting for metalcloak to send my suspension.
50 mph seems to be the most efficient speed IMO.

 

[JimWPB]

...
Another thing that puzzled me, my last jeep was also ecodiesel. It came with a banks kit, I pit 37s on it, was getting about 23 mpg (hand calc). Some told me diesels are far more efficient with extra weight. Not sure if that's true, but proof is in the pudding.
...

My experience with diesels is that they are far more efficient than gas motors when they are running right. A gallon of diesel is said to have about 1/3 more energy than a gallon of gas.

The best fuel efficiency I have ever gotten was from a 1999 VW TDI diesel. That would get 51mpg on the highway & 42 around town, hand calculated. An older VW diesel that I had in the 1980s got similar mpg, but produced less hp. It was normally aspirated. My current TDI Touareg gets over 30 on the highway & that beast weighs over a half ton more than my Jeep, which struggles to get 20. The Touareg also has a 7700 pound towing capacity & is fast. Even with all the crazy modern DPF emissions equipment in place, it still produces good power & MPG. Diesel has it's advantages. If the EcoDiesel had been available in a 2 door Wrangler, I would have bought one.

 

[swampflyer]

My experience with diesels is that they are far more efficient than gas motors when they are running right. A gallon of diesel is said to have about 1/3 more energy than a gallon of gas.

The best fuel efficiency I have ever gotten was from a 1999 VW TDI diesel. That would get 51mpg on the highway & 42 around town, hand calculated. An older VW diesel that I had in the 1980s got similar mpg, but produced less hp. It was normally aspirated. My current TDI Touareg gets over 30 on the highway & that beast weighs over a half ton more than my Jeep, which struggles to get 20. The Touareg also has a 7700 pound towing capacity & is fast. Even with all the crazy modern DPF emissions equipment in place, it still produces good power & MPG. Diesel has it's advantages. If the EcoDiesel had been available in a 2 door Wrangler, I would have bought one.

I beat your best with my best of 52. In and around town and short trips I get 45 to47 or so. 2015 TDI Jetta. I agree somewhat of the diesel in a 2 door but a different diesel.

 

[Valpo Jeep]

I really don’t care how accurate it is to be honest. Same with our Maserati. Neither were purchased with fuel economy maximizing in mind. In theory they both get over 20 mpg on the highway which was good enough for our needs.

The displayed fuel economy is close enough for us. Get in, check the fuel gauge, do we need to stop on this trip for today or tomorrow’s trip? If we need to stop then we check gas buddy for best price in the direction we are heading. I have never hand calculated fuel economy for either vehicle.

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