Needing to do rocket science to figure out your range is a joke like this thread. Run to empty one day and record the mileage before and after. Now whenever you drive just look at your odometer and make note of how many miles you have left. Me i use trip A, whenever i fill up.

 

Its not rocket science so much as basic multiplication. Average fuel economy x fuel accessable in tank = distance xj will travel before refuel is necessary.

So back to the original question, anyone ever run out of fuel? How much fuel did the tank take to fill up?

 

I think you're asking the wrong crowd here. It's pretty obvious that we're not stupid enough to run out of fuel in the first place.

Running low, or out, of fuel is very detrimental to the electric pump.

As for a mathematical calculation:

Stupid X guessing/calculating til we run out of fuel=recipe for disaster.

 

You haven't read a thing people wrote here. XJs have a 20 gal tank. So if you put your mind around it, if you stall out chances are youll only get 18.5-19.5 of gas back into the tank and you'll have to keep filling because the gas nozzle Will keep automatically shutting off.

So lets pretend for a moment that your not trolling along here. Fill your tank, drive until you Need more gas, fill up again. Divide number of miles driven by gal of gas filled. There your mpg. Do that 3 times, add all those mpg readings and divide by 3. There's your average. What other dang data you need. You drive and xj, do your own findings and readings.

 

Interesting. You bring up an important part of the equation. How can someone else's MPG be used to calculate your MPG? Too many factors. This must be done by the OP on his/her Jeep only. Otherwise, he/she will be using sketchy data. Not good.

Sketchy data + OP's concern = who gives a **** anyway.

 

Best post of this thread IMHO

 

ImHO, this is the best equation to the solution of trolls

 

Sig worthy, even...

 

The previous poster is correct that MPG varies from vehicle to vehicle, and even driver to driver. However, MPG is not the variable in the equation that I am looking for. I would like to know the design limitations of the XJ fuel tank. If we have a 20.3 gallon tank, but the pump cant suck out the last .8 gallon, then we only have a 19.5 gallon payload, add to that the aforementioned "air bubble" that inhibits the tank from being fully filled and you have even less fuel, maybe 18.5?

I would not advocate that anyone run their XJ out of fuel as this is probemati. However, there are often circumstances that are beyond the control of the posters here on CF. The fuel gauge is the least accurate guage on the XJ, if one were to fail, and a CF member ran out of fuel, how much would he be able to put into the tank to fill it up?

 

You are WAY over-thinking this. If you are going to fill up, put the frakking nozzle in and wait til it stops. Problem solved.

As for the accuracy of the fuel gauge, what are you basing this OPINION on? Never have had an issue with mine....

 

How long is a piece of string?

 

8 13/32" give or take

 

I agree. Why tempt the issue. Friends who owned Chevy Trucks have run out of gas. And damaged the fuel pump 1st time running dry. The knucklehead had to do it twice before he learned the lesson. Never run it low. Even those fuel cleaners for smog passing say to run near empty. I DO NOT. I'll put in another couple of gallons and then run . Then another couple of gallons. Run. Then fill up normally.
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Cruiser54- You have the best answer-WhoGives A bleep. Absolutely right.

Maybe we need to go make sure the gas pumps are calibrated just before we add the exact amount of gas before run out of gas. So precise fill up for precise calculation. Way over thinking a simple matter. Put gas in it, drive it. Put more gas in it.


Is that a calibrated tape measure you used? Better check it. Think you're 1/16" too short.

 

.

 

Roninofako
Fuel gauges are only for establishing a "general idea" of the amount of fuel in the tank. This is both a common and well understood fact.

http://auto.howstuffworks.com/fuel-gauge.htm

For example, if you were working out a flight plan (or rocket plan :-)), you would calculate your estimated fuel burn based on the average fuel burn of the aircraft (at a given RPM setting) and time. You would not rely on the fuel gauges.