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Author Topic: Fuel computer is a massive liar  (Read 2321 times)

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STEMO

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Fuel computer is a massive liar
« on: 06 September 2017, 19:23:56 »

On my new astra. Computer is telling me 41.8, brim to brim is telling me 36.9. That's quite a big fib.
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zirk

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Re: Fuel computer is a massive liar
« Reply #1 on: 06 September 2017, 19:54:50 »

Best to do it over a few fill ups, ie, dont reset the computer and keep track on your average fill ups.

Ive always found the Vauxhall MID type ones to on par with the actual, except (in my experience) the NCDC + GID/CIDs which Ive found can be far amount out normally reading a lot higher than actual.
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2boxerdogs

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Re: Fuel computer is a massive liar
« Reply #2 on: 06 September 2017, 20:28:57 »

My old Omega was spot on with the MPG computer the Merc is also very accurate, I would also advise to gauge it over a few fill ups.
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Migv6 le Frog Fan

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Re: Fuel computer is a massive liar
« Reply #3 on: 06 September 2017, 20:39:19 »

Should have bought an Omega. If its doing 17mpg, the fuel computer will tell you its doing 17mpg.  :y :y
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Doctor Gollum

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Re: Fuel computer is a massive liar
« Reply #4 on: 06 September 2017, 20:52:20 »

Should have bought an Omega. If its doing 17mpg, the fuel computer will tell you its doing 17mpg. And incessantly remind you to fill up every 221 miles  :y :y
You're not wrong ;D
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Field Marshal Dr. Opti

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Re: Fuel computer is a massive liar
« Reply #5 on: 07 September 2017, 11:28:23 »

On my new astra. Computer is telling me 41.8, brim to brim is telling me 36.9. That's quite a big fib.

Manufacturers like to be optimistic. :y

Drove the XFR down to Watford yesterday using mainly the A1 and M1.

Trip computer shows 30.6 MPG. :)

« Last Edit: 07 September 2017, 11:40:21 by Field Marshal Dr. Opti »
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TheBoy

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Re: Fuel computer is a massive liar
« Reply #6 on: 07 September 2017, 13:03:39 »

I've found the (unmolested) Omegas to be pretty accurate, certainly within 0.5mpg.  Which made the Jag's pack of lies unexplainable really.
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Grumpy old man

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Re: Fuel computer is a massive liar
« Reply #7 on: 07 September 2017, 13:09:56 »

I've found the (unmolested) Omegas to be pretty accurate, certainly within 0.5mpg.  Which made the Jag's pack of lies unexplainable really.

I certainly wouldn't be impressed with 36.9 MPG from a derv Astra. Tunnie must be shaking his head in disbelief. ::)

Perhaps the additional weight of wife and whippet is dragging it down. :)
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TheBoy

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Re: Fuel computer is a massive liar
« Reply #8 on: 07 September 2017, 13:23:36 »

I've found the (unmolested) Omegas to be pretty accurate, certainly within 0.5mpg.  Which made the Jag's pack of lies unexplainable really.

I certainly wouldn't be impressed with 36.9 MPG from a derv Astra. Tunnie must be shaking his head in disbelief. ::)

Perhaps the additional weight of wife and whippet is dragging it down. :)
Its an auto though (or did I dream that), and the engine ain't nowhere near big enough for anything other than manual.
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tunnie

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Re: Fuel computer is a massive liar
« Reply #9 on: 07 September 2017, 13:42:48 »

Can't say I've seen 30's average ever out of the VW, but then again it's used for work and long runs up north. So always gets  a good long run.

However even leaving work, in stop start traffic fighting my way through to either the M3 or M25 it will still average 40.something average.

But then again mine is a manual
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STEMO

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Re: Fuel computer is a massive liar
« Reply #10 on: 07 September 2017, 15:16:31 »

I've found the (unmolested) Omegas to be pretty accurate, certainly within 0.5mpg.  Which made the Jag's pack of lies unexplainable really.

I certainly wouldn't be impressed with 36.9 MPG from a derv Astra. Tunnie must be shaking his head in disbelief. ::)

Perhaps the additional weight of wife and whippet is dragging it down. :)
Its an auto though (or did I dream that), and the engine ain't nowhere near big enough for anything other than manual.
The engine is plenty big enough. FFS, they put an auto box on a weedy 1.6 petrol. A 2.0 diesel handles it nicely.
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tunnie

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Re: Fuel computer is a massive liar
« Reply #11 on: 07 September 2017, 15:59:26 »

I've found the (unmolested) Omegas to be pretty accurate, certainly within 0.5mpg.  Which made the Jag's pack of lies unexplainable really.

I certainly wouldn't be impressed with 36.9 MPG from a derv Astra. Tunnie must be shaking his head in disbelief. ::)

Perhaps the additional weight of wife and whippet is dragging it down. :)
Its an auto though (or did I dream that), and the engine ain't nowhere near big enough for anything other than manual.
The engine is plenty big enough. FFS, they put an auto box on a weedy 1.6 petrol. A 2.0 diesel handles it nicely.

The put an Auto on the 1.4 Zaf Tourer  :D

2.0 diesel in any modern form is quite punchy and quick enough for most normal folk  :)
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2boxerdogs

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Re: Fuel computer is a massive liar
« Reply #12 on: 07 September 2017, 16:37:02 »

Is that mainly town/short journey mileage? If not it's awful get 27-33 from my Merc.
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STEMO

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Re: Fuel computer is a massive liar
« Reply #13 on: 07 September 2017, 16:47:57 »

Is that mainly town/short journey mileage? If not it's awful get 27-33 from my Merc.
Yes, mainly town driving.
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Viral_Jim

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Re: Fuel computer is a massive liar
« Reply #14 on: 07 September 2017, 17:07:30 »

Not bad then tbh. Autos in general at naff in town (dsg being the exception). 35 is probably about what the Volvo gets in town, which is why I never use it there  ;D. The trip computer thing is odd though. Is there any way to adjust/recalibrate it?  :-\
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