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Old 23-02-2013   #31
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Re: Sh*te MPG. :(

Quote Originally Posted by Most Easterly Pandas View Post
No, you fill to the same level (ie brimmed and about to dribble out of the tank) not fill with the same number of Litres as thats not going to tell you much.
Surely if you run it dry and then fill with say 20 litres every time it would still be accurate, the calculator doesn't care how many litres your tank can hold so surely it'd just be like having a 20 litre tank?
Personally I never brim my car because if I do and an unexpected payment comes my way I wouldn't be able to afford it (Imma typical poor student)
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Old 23-02-2013   #32
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Re: Sh*te MPG. :(

Quote Originally Posted by Most Easterly Pandas View Post
Rubbish, loads of fun annoying everyone following!



No, you fill to the same level (ie brimmed and about to dribble out of the tank) not fill with the same number of Litres as thats not going to tell you much.

I had someone use the left hand lane here: http://goo.gl/maps/7ge4k

And go right on me this morning.

Then he pulled into an industrial estate just off the roundabout! What was he hoping to achieve!??!

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Old 23-02-2013   #33
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Re: Sh*te MPG. :(

Quote Originally Posted by Most Easterly Pandas View Post
Rubbish, loads of fun annoying everyone following!



No, you fill to the same level (ie brimmed and about to dribble out of the tank) not fill with the same number of Litres as thats not going to tell you much.
Quote Originally Posted by Didge3 View Post
Surely if you run it dry and then fill with say 20 litres every time it would still be accurate, the calculator doesn't care how many litres your tank can hold.


FIlling the tank to full and running to dry will give you total miles to the tank.

Like my above example, if you where to put 20litres in on the 10th and then another 20litres in a week it will give you an accurate mpg calculation. BUT if you where to just 'top up' in between and put less/more its not going to be an accurate mpg calculation.
the calculators don't know (or care) how much is already in your tank so would think you have already used the previous 20l hence why it would give you a more inaccurate calculation.


the calculators only estimate the mpg reading per data imput, then over a period of 5 (random number) top ups (if the calculator records it) it will give you a overall average from the past fills.
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Old 23-02-2013   #34
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Re: Sh*te MPG. :(

Quote Originally Posted by ban1111 View Post
Mmmm? that all depends on each individual car take the mondeo mk3, with a 6 speed gearbox, it would actually be better in 5th at 56mph on a mondeo speedometer than in 6th. 5th gear 30mph/1000 against sixth gear 35mph/1000 mph..so you are sitting in a sweet spot in the torque and to travel at 74mph you need almost 20% more power than at 56mph to push you through the air.
i do hope these on not trip computer readings as i would love my well sorted 2.2tdci to hit 60mpg at 74mph, but in 4 years have never got it to average that fill up to fill up none build up area travels.....
2.0 diesel 6 speed ghia, yes computer readings. Regular 420 mile journeys always resulted in 60mpg at motorway speeds with 4 adults, wife always managed o get a reading of 61-62

Quote Originally Posted by dombooth View Post
I'm just gonna have to live with it aren't I.
buy a doblo
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Old 23-02-2013   #35
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Re: Sh*te MPG. :(

Quote Originally Posted by Reuuk View Post
but you do fill it with the same amount of fuel (in litres) every time? its the only way your going to get a accurate results from the calculator.

with you saying you do start stop all the time thats going to be the killer in mpg unfortionatly
To do a manual calculation on MPG you need to fill upto the same point on every fill up, thats the only way you can measure the amount of fuel that has been used on the previous tank full.

Trip computer isn't bothered what you fill with, 5L, 50L, it makes no difference, as it works out MPG on distance, vs fuel used since Trip reset, and driving style. Trip computer is never accurate either tbh, not worth bothering with imo.
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Old 23-02-2013   #36
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Re: Sh*te MPG. :(

Quote Originally Posted by T14086 View Post
2.0 diesel 6 speed ghia, yes computer readings. Regular 420 mile journeys always resulted in 60mpg at motorway speeds with 4 adults, wife always managed o get a reading of 61-62



buy a doblo
Right first of all let me say the mondeo tdci is a decent lump and when cruising is indeed a frugal car for its age,but to use a trip computer reading as a fact of
your cars mpg is not a good idea as they over and indeed can also under read at times. the only way to know what your cars real mpg is, is a brim to brim refill/
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Old 23-02-2013   #37
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Re: Sh*te MPG. :(

Quote Originally Posted by T14086 View Post
2.0 diesel 6 speed ghia, yes computer readings. Regular 420 mile journeys always resulted in 60mpg at motorway speeds with 4 adults, wife always managed o get a reading of 61-62



buy a doblo
Doblo's are too square and van'ish for my liking.

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Old 23-02-2013   #38
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Re: Sh*te MPG. :(

get an AGP..... 30 mpg in mine currently.... thats not to bad P

On a serious note, its all to do with how quickly you accelerate and brake, there is no point having your foot on the accelerator for 15 seconds before you have to brake.

Little changes like that will make a big difference in stop start driving, and also how quickly you accelerate determines fuel use.

hilariously, it has been tested that full acc to 2,000 rpm and change can increase mpg
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Old 23-02-2013   #39
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Re: Sh*te MPG. :(

Quote Originally Posted by TallTom View Post
get an AGP..... 30 mpg in mine currently.... thats not to bad P

On a serious note, its all to do with how quickly you accelerate and brake, there is no point having your foot on the accelerator for 15 seconds before you have to brake.

Little changes like that will make a big difference in stop start driving, and also how quickly you accelerate determines fuel use.

hilariously, it has been tested that full acc to 2,000 rpm and change can increase mpg
I would love an AGP but don't think it'll go up my drive.

Yeah, I don't accelerate/brake that quickly but I don't like messing around.

I'd be forever changing gear and never get anywhere doing that.

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Old 23-02-2013   #40
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Re: Sh*te MPG. :(

Quote Originally Posted by Most Easterly Pandas View Post
To do a manual calculation on MPG you need to fill upto the same point on every fill up, thats the only way you can measure the amount of fuel that has been used on the previous tank full.

Trip computer isn't bothered what you fill with, 5L, 50L, it makes no difference, as it works out MPG on distance, vs fuel used since Trip reset, and driving style. Trip computer is never accurate either tbh, not worth bothering with imo.

I haven't touched/used/looked/reset trip computer. I work out mpg via millage > per gallon per fill up then my app averages it out over the previous data inputs
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Old 23-02-2013   #41
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Re: Sh*te MPG. :(

Quote Originally Posted by ban1111 View Post
Right first of all let me say the mondeo tdci is a decent lump and when cruising is indeed a frugal car for its age
Thanks but I'm more than aware of the mondeo's capabilities.

Quote Originally Posted by ban1111 View Post
but to use a trip computer reading as a fact of
your cars mpg is not a good idea as they over and indeed can also under read at times. the only way to know what your cars real mpg is, is a brim to brim refill/
Who can afford to fill up a car these days....plus more fuel = less weight = less fuel consumption! Best way is to put a litre of fuel in a empty tank until it runs out.



Quote Originally Posted by dombooth View Post
Doblo's are too square and van'ish for my liking.

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Old 23-02-2013   #42
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Re: Sh*te MPG. :(

Quote Originally Posted by Reuuk View Post
I haven't touched/used/looked/reset trip computer. I work out mpg via millage > per gallon per fill up then my app averages it out over the previous data inputs
But unless you brim it to fill, the same point every time, you have no way of knowing how much fuel you've used to the number of miles you've covered. Putting in 20L each time doesn't mean you've used 20L as there could have been 5L still floating about in there, or on the tank before 10L, and you've no way of knowing how much is left in there short of running dry of fuel, or brimming the tank.
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Old 23-02-2013   #43
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Re: Sh*te MPG. :(

To summarize; MPG is for nerds and those nerds can't figure it out.

The answer to this problem is clear; let's all buy V8s.
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Old 23-02-2013   #44
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Re: Sh*te MPG. :(

Quote Originally Posted by Magic Johnson View Post
To summarize; MPG is for nerds and those nerds can't figure it out.

The answer to this problem is clear; let's all buy V8s.


If you pay my insurance I might even stretch to a V12 !
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Old 24-02-2013   #45
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Re: Sh*te MPG. :(

Quote Originally Posted by T14086 View Post
Thanks but I'm more than aware of the mondeo's capabilities.



Who can afford to fill up a car these days....plus more fuel = less weight = less fuel consumption! Best way is to put a litre of fuel in a empty tank until it runs out.
! clearly you are not! otherwise the one thing you would not do on a mondeo for sure is purposely run it out of fuel! in fact its a daft thing to do in any modern diesel with any sort of mileage under its belt . I would kindly suggest nobody do that method to work out their fuel economy on a common rail diesel.
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