Accuracy of Km/Miles till Empty readout?

Discussion in 'Fiesta ST Chat and Discussion' started by MasterPooBaa, Jul 5, 2014.

  1. MasterPooBaa

    MasterPooBaa Member

    Pulled into the servo last night, LCD Display reading 49Km (30miles) till empty.
    Been doing city traffic driving all week. Gauge was sitting off empty at the 1/8 mark

    Now according to all official documents, the ST has a 48L fuel tank... And I managed to fit 47.5L before the pump went 'click'. Methinks I wouldn't be able to do that last 49Km on just half a Liter of motion-lotion.

    Anyone else found the Distance to Empty figures... optimistic?
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  3. iLiptiKal

    iLiptiKal Active Member

    Yeah I'd agree, I don't think I've ever gotten the same number of KM's as the computer estimate. I don't reset the fuel consumption every fill-up though, just my trip meter to track my milage manually.
  4. BlackBird

    BlackBird Active Member Staff Member

    I wouldn't trust it further than I could throw my FiST.
    Firesail likes this.
  5. AT-ST

    AT-ST New Member

    The estimated distance usually starts out optimistic when I first fill the tank. Example: it says 490 km to empty when I fill up. But when I go to fill up next time with only 20km to E, I have only travelled 420km that trip adding up to 440km total (50km less than the original estimate). Who knows how far I could have actually gone.
    I don't know how you could really tell how accurate it is though without driving until empty.

    I will say, I have made it to a gas station at 2 km to empty on one occasion without any problems. According to my history, the MOST fuel I have ever put in during a fill up has been 41.68 Litres (And that just so happens to also be the trip that I arrived at the gas station with only 2 KM to empty showing on the display.) (The trip was a 432 km trip ) INTERESTINGLY when I filled up my tank before that trip the estimate when my tank was full was predicted to be 431 KM to empty. (Pretty close to my actual 432 km trip + 2 km to empty) By the time I was down to maybe 10 km to E and panicking in my search for gas, I probably travelled easily 3 times that by the time I was down to "2 km to E" just by coasting in neutral whenever possible, and very carefully selecting which gear to operate in. A mistake I will not be making again. I don't intend to find out if I could get away with any lower than 2km to empty, nor do I intend to let it get that low again. And for the record I was running at 2km to empty for a while, so I'm pretty sure I was about to tick 1km to E ! hehe

    The issue with tracking this "to empty" distance is that it can change pretty drastically depending on what kind of traffic you find yourself in, idling Highway vs City, stop lights... etc. To me it's just an estimated guess based on your current consumption, but not able to factor in so many variables that impact the results.

    To me it seems pretty accurate. And also accurate for keeping track of mileage/efficiency. I always compare the computers #'s to my manual calculations.

    When I checked the Ford website spec's it listed the ST as having 47 L fuel capacity. Interesting that I have never been able to put in more than 42 L (Even when I was as low as 2 km to empty). 5 L cushion?
    Last edited: Jul 5, 2014
  6. WScottCross

    WScottCross Well-Known Member

    I run mine pretty low quite often. I have found that mine seems to fairly conservative. For example, when it says 30 miles to empty, I can only put 10.5 gallons in. I have run it past 0 miles to empty several times. I was a bit nervous doing that, but I think the most I ever put in was 11.8 gallons.
  7. reddog99

    reddog99 Active Member

    In my experience, the "Miles to Empty" readout is less accurate than the needle for the gas gauge. The readout will vary from over-estimating to under-estimating the amount of fuel left, depending on whether it has seen highway or city driving.

    You would think that Ford could make the system more accurate, considering how much is computerized on the car. I have personally driven 50 miles past zero in my 2011. I haven't tried that with the ST, and I think I trust reading the needle on the gas gauge more than the computer's estimate.

    It's better to take the readout as a warning, rather than as hard number for the amount of fuel left. There's just too much uncertainty.
    Last edited: Jul 6, 2014
  8. MasterPooBaa

    MasterPooBaa Member

    Interestingly the fuel gauge was still a little way from touching the red E mark. Good to know how close I got to true empty. Most likely wont be doing that again :)
  9. BlackBird

    BlackBird Active Member Staff Member

    I don't think I've ever put more than 11 gallons even into my car.
  10. Cesso

    Cesso Member

    I don't take the reading seriously, but I do use it as an indicator. Working for a Ford dealer, many cars we receive are low on gas and when I see 15mi or less remaining I generally put them aside to get filled. However I do know that you can still go a good distance when it says 0mi till empty, I know of several that have been driven around the lot, through service, and still made it the 1.5mi to the gas station while saying 0mi.
  11. Mikeygti

    Mikeygti Active Member

    After my MP215 ecu flash, the KMs to empty jumped up to like 865. I wish ! lol After a few fill ups it has gradually returned to normal ( 600ish )
  12. Novascotiafiestast

    Novascotiafiestast New Member

    When i bought my car 3 mths ago it said 740kms to E. I only have 1900 kms on it now and has dropped to 490 kms to E. I DRIVE MOSTLY HWY

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