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#913128 - 2nd Dec 2014 11:48am Car losing petrol?
Maxandlucy Offline
Beginner

Registered: 16th Aug 2014
Posts: 9
Loc: Wirral
Hi,I have a nissan,put some fuel in,dashboard display said 99 miles left,hit the trip to see how it far was home,got home,said I had driven 1.9 miles,display said there was 92 left in tank!!,so 6 to 7 miles missing??

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#913130 - 2nd Dec 2014 12:20pm Re: Car losing petrol? [Re: Maxandlucy]
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
It works out your average MPG, therefore if you had been on the motorway, or driving economically before adding fuel it would show a higher range. Also starting the car uses more fuel, so sometimes if you had 100miles remaining arriving home one evening, the next morning it could show 80 as it has been cold started and used more fuel in the process.

Fuel also expands with heat, so there can be less volume of fuel when the car has been left overnight and its cold in the morning.
_________________________


What If There Were No Hypothetical Questions?

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#913240 - 2nd Dec 2014 10:17pm Re: Car losing petrol? [Re: Maxandlucy]
mrhanky Offline
Forum Addict

Registered: 1st Dec 2010
Posts: 1236
Loc: my house
petrol thief??

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#913242 - 2nd Dec 2014 10:51pm Re: Car losing petrol? [Re: Maxandlucy]
Elizabeth Offline
Veteran

Registered: 28th Jul 2011
Posts: 718
Loc: Prenton, Wirral
Mine does that too, Maxandlucy but then on other occasions if I'm going at a consistent speed on the motorway for a long-ish distance, it will increase the number of miles allegedly left in the tank. It baffles me.

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#913252 - 3rd Dec 2014 12:31am Re: Car losing petrol? [Re: Elizabeth]
Wally1 Online   content
Addict

Registered: 13th Feb 2010
Posts: 269
Loc: Wallasey
Originally Posted By: Elizabeth
Mine does that too, Maxandlucy but then on other occasions if I'm going at a consistent speed on the motorway for a long-ish distance, it will increase the number of miles allegedly left in the tank. It baffles me.


My Omega does exactly that. All that is happening is that
the "computer" assesses your driving and current consumption and recalculates the remaining miles you have left. So if you have a spell of heavy usage around town, the miles drop quickly but if you then get onto a motorway where consumption is less, your remaining miles will increase - seems wrong but is actually right. It is only a guide because it doesn't know if you might next have a spell of heavy consumption.

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#913335 - 3rd Dec 2014 2:20pm Re: Car losing petrol? [Re: Maxandlucy]
Gibbo Online   content
Forum Addict

Registered: 27th Dec 2010
Posts: 1722
Loc: Oxton
Same with mine. Low fuel light will come on and report 60 miles left on the info screen, but I can do ten miles at a steady 50 mph and the value won't change!

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#913378 - 3rd Dec 2014 7:21pm Re: Car losing petrol? [Re: Maxandlucy]
j_demo Online   Know_it_all
Forum Addict

Registered: 4th Nov 2011
Posts: 1839
Loc: Wallasey/New Brighton
it's as StuyMac says, it works on averages.

i'll use the "bike" analogy:

petrol = energy

if you had say 100 units of energy in your body and it takes 10 units to cycle a mile then you can get 10 miles out of them 100 units. but if you had to cycle up hill you would use say 20 units of energy taking your expected distance for that amount of energy down to 5 miles, so if you're going faster/going uphill/driving into a strong headwind/in slow moving traffic you will naturally use more fuel than if you were on the straight and true's of a motorway cruising at a higher speed.

1 gallon of petrol in a car could get you on average 50 miles, so if you cruised down the motorway at say 70mpg's you'd do 70 miles, but if you were on side roads doing 40mpg then you would only get 40 miles.

it's all dependant on a number of factors.

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#915696 - 15th Dec 2014 5:19pm Re: Car losing petrol? [Re: Maxandlucy]
Excoriator Offline
Wise One

Registered: 21st Jan 2010
Posts: 791
Loc: wirral
All these theories flashed through my mind on one occasion when I noticed the petrol gauge falling over a five minute drive in a courtesy car I once had.

Unfortunately some toad had drilled a hole in the petrol tank to steal the fuel (Yes it WAS petrol too!) I had mixed feelings about the fact that he'd failed to blow himself and the car to bits in the process.

Rather less mixed when I realised the effect on my no claims bonus!

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