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Author How does an mpg guage in a car work?
Dean_W
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Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline
3rd Jun 08 at 13:15   View User's Profile U2U Member Reply With Quote
How do they work?

Are they really accurate?
Tiesto
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Registered: 6th Jun 02
Location: Hinckley, Leicestershire
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3rd Jun 08 at 13:19   View User's Profile U2U Member Reply With Quote
Aint a clue how the work, but mine is not accurate, it works out i get 3mpg less than what it actually says.
nova_gteuk
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Registered: 15th May 02
Location: South Wales Drives: The Bandwagon
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3rd Jun 08 at 13:23   View User's Profile U2U Member Reply With Quote
The ECU knows your speed in miles per hour,and it knows the fuel flow in gallons per hr,there is a flowmeter in there somewhere-or an indirect flowmeter based on the pressure and number of squirts, duration of squirts of the Fuel injectors(or fuel pump).
Dean_W
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Registered: 13th Dec 05
Location: Downham Market, Norfolk
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3rd Jun 08 at 13:23   View User's Profile U2U Member Reply With Quote
Rite..........
deano87
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Registered: 21st Oct 06
Location: Bedfordshire Drives: Ford Fiesta
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3rd Jun 08 at 13:27   View User's Profile U2U Member Reply With Quote
But if you want to work out as true MPG as you can.

Fill up to the brim, reset odometer thing.

Wait until you next fill up. Make a note of the miles from odometer. Fill up again to the brim. Get a receipt detailing litres purchases.

Litres x 0.22 = gallons.

Mileage / gallons = MPG
GT190
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Registered: 6th Dec 07
Location: Greater London
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3rd Jun 08 at 13:37   View User's Profile U2U Member Reply With Quote
or http://www.torquecars.com/tools/uk-mpg-calculator.php
Dean_W
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Registered: 13th Dec 05
Location: Downham Market, Norfolk
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3rd Jun 08 at 13:56   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by GT190
or http://www.torquecars.com/tools/uk-mpg-calculator.php


39MPG......
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
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3rd Jun 08 at 13:59   View User's Profile U2U Member Reply With Quote
most OE systems work on a calculation of engine load i.e throttle pedal position, engine speed and an RPM reading.
myke
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Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
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3rd Jun 08 at 14:03   View User's Profile U2U Member Reply With Quote
digital mpg gauges are as said.
economy meter gauges like on mercs and beemers are just vacuum from inlet as far as i'm aware, and they calibrate the backing to be close to accurate. the scales usually aren't constant though, so they're not that great.

 
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