Page 1 of 7 123 ... LastLast
Results 1 to 10 of 66

Thread: Gas reserve? Is it real, and if so how big is it?

  1. #1
    Member
    Join Date
    Aug 2021
    Location
    Northern Ontario
    Country
    Canada
    Posts
    86
    Thanks
    20
    Thanked 14 Times in 13 Posts

    Gas reserve? Is it real, and if so how big is it?

    I refueled my car tonight. The gas indicator was doing the blinky warning thing, so I knew I should probably fill up. However when I filled all the way to the "thunk" sound the gas nozzle makes I only put 25.18L into the car. I'm curious as to why there's the big discrepancy between the 35L listed tank size and the 25L fill up?

    Is there some sort of reserve in the tank that doesn't show up on the indicator? Just curious.



  2. #2
    Senior Member klroger's Avatar
    Join Date
    Nov 2018
    Location
    ottawa valley
    Country
    Canada
    Posts
    502
    Thanks
    36
    Thanked 262 Times in 188 Posts
    I think you're right, they give us a large reserve for a margin of safety. I was returning home from a visit to family & my fuel gage started flashing ~ 100 km from home. It was @ night with gas stations closed. I just kept driving & made it home & the next day I filled up with 31 liters. I think Mitsubishi wants to look after us & make sure we aren't on the side of the road out of gas!!!
    I didn't know what to do, so I didn't do anything

        __________________________________________

        click to view fuel log View my fuel log 2018 Mirage GT 1.2 automatic: 37.8 mpg (US) ... 16.1 km/L ... 6.2 L/100 km ... 45.4 mpg (Imp)


  3. The Following 2 Users Say Thank You to klroger For This Useful Post:

    Cam123 (11-05-2021),vintzend (04-16-2022)

  4. #3
    Member
    Join Date
    Aug 2021
    Location
    Northern Ontario
    Country
    Canada
    Posts
    86
    Thanks
    20
    Thanked 14 Times in 13 Posts
    Very interesting thanks! It's certainly quite a margin of safety. At 5L/100km that's just under 200km of driving!! Lol I definitely won't stress about the flashy thing now. I'll fill up when it does, but it won't raise my stress level.

  5. #4
    Senior Member Fummins's Avatar
    Join Date
    Oct 2016
    Location
    Caracas
    Country
    Venezuela
    Posts
    6,998
    Thanks
    2,981
    Thanked 3,482 Times in 2,349 Posts
    My one mirage would take 28 liters when all the bars were gone and gauge blinked. The other car took 31 liters with one bar remaining no blinking. Your experience will vary…

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)


  6. #5
    Senior Member
    Join Date
    May 2021
    Location
    n/a
    Country
    Australia
    Posts
    218
    Garage empty: add car
    Thanks
    34
    Thanked 65 Times in 45 Posts
    Per the book when the last segment starts flashing you have 6 litres, when the entire gauge starts flashing you have 3 litres. This assumes you are on level ground, if you try driving up to the hill gas station with 3 litres you may not get there.

    As for why you only got 25L in, the bowsers have a tendency to close as soon as they sense gas coming up, but you can put considerably more in if you just trickle it in when it's starting to get full, obviously you don't really want to fill it up to the neck as you may be endangering your gas fume recirculation system.

  7. #6
    Senior Member Fummins's Avatar
    Join Date
    Oct 2016
    Location
    Caracas
    Country
    Venezuela
    Posts
    6,998
    Thanks
    2,981
    Thanked 3,482 Times in 2,349 Posts
    Quote Originally Posted by skyblue View Post
    Per the book when the last segment starts flashing you have 6 litres, when the entire gauge starts flashing you have 3 litres. This assumes you are on level ground, if you try driving up to the hill gas station with 3 litres you may not get there.

    As for why you only got 25L in, the bowsers have a tendency to close as soon as they sense gas coming up, but you can put considerably more in if you just trickle it in when it's starting to get full, obviously you don't really want to fill it up to the neck as you may be endangering your gas fume recirculation system.
    That what everyone says. After I replaced my engine I filled the tank to the neck at a gas station then drove home and topped it off again, right to to top from a jerry can. My next fill was just at a gas station, I sat there clicking away for a while and got 35 liters in it. So far so good. I'll continue doing this until it gets to cold out or something actually does happen.

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)


  8. #7
    Member
    Join Date
    Aug 2021
    Location
    Northern Ontario
    Country
    Canada
    Posts
    86
    Thanks
    20
    Thanked 14 Times in 13 Posts
    Thanks for the info. I read more on How Stuff Works. "A small pipe called a venturi runs alongside the gas nozzle. When the end of the venturi pipe becomes submerged in the rising gas, it chokes off the air pressure that holds the nozzle handle open and shuts down the flow of gas. Unfortunately, this shutdown can sometimes happen before the tank is full as the rapidly flowing gas backs up on its way into the tank. This can cause the gas handle to spring open before pumping is complete, leaving the annoyed customer to squeeze the handle again and risk the possibility of overflow. " I may or may not give this a go next time. Trickle away.

  9. #8
    Senior Member PityOnU's Avatar
    Join Date
    Aug 2020
    Location
    WA, USA
    Country
    United States
    Posts
    400
    Thanks
    94
    Thanked 182 Times in 127 Posts
    The question's already been answered here, i.e. yes, the pump may have shut off prematurely and also, yes, modern vehicles all have a decently-sized reserve that doesn't register on the gauge.

    Just figured I'd comment to say how funny it is that even though we can easily design a 100% accurate fuel gauge, and that people kind of universally understand that no fuel == no go, people must have still run out of fuel and been stranded so regularly that companies decided it was just going to be easier to trick everyone into putting more fuel in their car before it was empty than it was to expect people not to "ride that line."

    Humans are weird.

  10. The Following User Says Thank You to PityOnU For This Useful Post:

    dspace9 (04-15-2022)

  11. #9
    Related thread... many, many examples...

    Thread: What's the most gas you've ever filled in your Mirage?




        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage ES 1.2 manual: 55.3 mpg (US) ... 23.5 km/L ... 4.3 L/100 km ... 66.4 mpg (Imp)


  12. #10
    Senior Member
    Join Date
    May 2021
    Location
    n/a
    Country
    Australia
    Posts
    218
    Garage empty: add car
    Thanks
    34
    Thanked 65 Times in 45 Posts
    Quote Originally Posted by Fummins View Post
    That what everyone says. After I replaced my engine I filled the tank to the neck at a gas station then drove home and topped it off again, right to to top from a jerry can. My next fill was just at a gas station, I sat there clicking away for a while and got 35 liters in it. So far so good. I'll continue doing this until it gets to cold out or something actually does happen.
    I just don't feel like fixing it if something does happen, the car is meant to save money and work, not the other way.

    Name:  3.jpg
Views: 565
Size:  97.6 KB
    Name:  1.jpg
Views: 567
Size:  56.4 KB



  13. The Following User Says Thank You to skyblue For This Useful Post:

    MetroMPG (11-06-2021)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •