75ZT Community

I was wondering how accurate the fuel consumption is on the trip computer. I was driving down the M18 today with cruise control set at 70 and i was curious and had a look to see what mpg i was doing.
first result was 91mpg
second result was 87mpg
third time was 81mpg

Got bored after that
So how true is the reading and if its not even close then why bother putting it on in the first place?

Johno

johnwh74 wrote:I was wondering how accurate the fuel consumption is on the trip computer. I was driving down the M18 today with cruise control set at 70 and i was curious and had a look to see what mpg i was doing.
first result was 91mpg
second result was 87mpg
third time was 81mpg

Got bored after that
So how true is the reading and if its not even close then why bother putting it on in the first place?

Johno

It is more accurate over a greater period of time / miles....but still rather optimistic....why put it there? Cos all the other 'quality' cars have it...

Since Monk installed my trip computer IPK (Instrument pack (IPK from the German)) a few weeks ago mine has been fairly accurate at 31-35 mpg. Thanks again Dave. . Brim to brim I get 29 - 30

You can adjust them after a series of runs, to become far more accurate, more so when Re Mapped / synergy fitted.
A synergy on the diesel makes the MPG optimistic by between 10% and 20%.

When you did the readings did you reset the counter? This would give false readings as the vehicle needs to be stood still when you reset.

The calculations are done over the last few miles every so often, so if you reset while moving, your mileage records higher than your Fuel Consumption, giving innacurate readings i.e 50Mpg etc when in fact it should be 35Mpg if that makes sense.

You probably know that, so if you do, sorry - Wasn't trying to be smart

I get a rather nice 26 - 29Mpg now around town and 35 - 36Mpg on the Motorway (more if I drop to 65Mph)

carlpenn wrote:When you did the readings did you reset the counter? This would give false readings as the vehicle needs to be stood still when you reset.

The calculations are done over the last few miles every so often, so if you reset while moving, your mileage records higher than your Fuel Consumption, giving innacurate readings i.e 50Mpg etc when in fact it should be 35Mpg if that makes sense.

You probably know that, so if you do, sorry - Wasn't trying to be smart

I get a rather nice 26 - 29Mpg now around town and 35 - 36Mpg on the Motorway (more if I drop to 65Mph)

I reset them while i was still driving, Damn now i have had my dreams of 81mpg shattered
I didnt know that Carl so i am using that as learning something new everyday, something i am finding alot since becoming a 75 owner

Brim to brim i am getting about 550 miles with a 164k 75 diesel

thanks John

Reset it and then Do a blast off standing start!!! .... see how low you get !!! .. not too often though unless you can afford it !!!

My Zt auto has achieved 7.2 mpg.

Chris

ceedy wrote:Reset it and then Do a blast off standing start!!! .... see how low you get !!! .. not too often though unless you can afford it !!!

My Zt auto has achieved 7.2 mpg.

Chris

I will try that when i go to pick Amy up from work

Lowest mpg i have driven was a 5.4 litre Ford Experdition when we was in USA, had it reading 5.5mpg . didnt do that very often though!!

John