GTI Fuel economy

[dean5125]

OP - just to make absolutely sure, show us your calculations and lets eliminate the possibility of mis-calculations because I have to agree, my trips never been more than 5-10% out either !

[GeeTeeAye]

Something like this...
It was easy at the start, because mileage was as good as 0 on collection. so calculating what went in and mileage achieved easy enough.
After 1000 miles covered- Once "35 miles to go" shown on gauge, i note mileage, visit petrol station ASAP. Note number of litres bought for my £x quids worth of fuel.
Once I get "35 mile to go" signal again, repeat.. (not being doing this so much last while, because life is too short).

Rough and ready.   I have approx miles covered, I know amount of gallons put in. Casio does the rest.
= approx MPG

Don't get me wrong I can live with it, I was just wondering if it was normal. I do about 20 miles a day of mixed driving 30 to 70 roads. Im not stuck in traffic jams etc. Heres hoping I get into the 30's like a lot here as it gets run in further, but if not, no worries Im enjoying owning it.

[Watts]

If you don't mind my saying, as easy as the explanation makes it there is room for Mr Cockup to make a visit. What does the display in the car say your mpg is? I'd just go by that, it's very accurate and removes the possibility for errors. It will display the average economy for the journey, since fill up or long term.

[Talk-torque]

Using range to calculate mileage is not good. You will have noticed that the reading goes in fives, so is +/-5 at best. The reading it shows is an instantaneous reading, reflecting the car’s current consumption. Thus, if you are doing full throttle blasts it will rapidly drop, but, if you are cruising on a light throttle, it will remain static, or even increase.

The best way to calculate mileage is to fill the tank to the brim and note the mileage reading. Run the car, as normal, until it’s time to refuel again. Brim the tank, noting the litres required and the new mileage reading. The consumption is this mileage reading divided by the gallons required. To convert litres to gallons divide by 4.546.

Incidentally, my March 2019 Performance DSG is averaging 36mpg, calculated from delivery in the above way, and currently at just over 5,000 miles. This is over mixed driving, probably 50/50 town/cruising, without much heavy traffic.

[Yusee]

Using range to calculate mileage is not good. You will have noticed that the reading goes in fives, so is +/-5 at best. The reading it shows is an instantaneous reading, reflecting the car’s current consumption. Thus, if you are doing full throttle blasts it will rapidly drop, but, if you are cruising on a light throttle, it will remain static, or even increase.

The best way to calculate mileage is to fill the tank to the brim and note the mileage reading. Run the car, as normal, until it’s time to refuel again. Brim the tank, noting the litres required and the new mileage reading. The consumption is this mileage reading divided by the gallons required. To convert litres to gallons divide by 4.546.

Incidentally, my March 2019 Performance DSG is averaging 36mpg, calculated from delivery in the above way, and currently at just over 5,000 miles. This is over mixed driving, probably 50/50 town/cruising, without much heavy traffic.

Yes, this is the method i use.
I should clarify that my calculated mpg is usually within 5% of computer, typically 32mpg displayed v 30 or 31 by own calculations

[Talk-torque]

I should clarify that my calculated mpg is usually within 5% of computer, typically 32mpg displayed v 30 or 31 by own calculations

Yes, I agree with that. Not bad accuracy, just a little optimistic.

[dean5125]

Agree total with the man maths there.... the trip is always going to be slightly optimistic, this is VW we are talking about!

live with what the trip is telling you and just enjoy the car, they are fantastic!!!

[andy28]

ThinkBlue is a load of crap. My trip into work this morning.

Not sure what you mean about ThinkBlue being crap Jim 

[Jim_mk7.5]

ThinkBlue is a load of crap. My trip into work this morning.

Not sure what you mean about ThinkBlue being crap Jim 

  Briiliant! Exactly, it's got about 5% to do with how you use your right foot and 95% of what type of route you do and the traffic!

[andy28]

I know right! To be honest I don't normally get such a low score - I just think she wasn't happy with me this morning.

The two images have made me realise how old school my display looks