Make a donation
« previous next »
Pages: [1] 2 3   Go Down

Author Topic: Poor MPG theory doesnt match actual  (Read 4760 times)

Offline jakex181

  • Always Involved
  • ****
  • Thank You
  • -Given: 4
  • -Receive: 2
  • Posts: 202
Poor MPG theory doesnt match actual
« on: October 28, 2013, 09:37:05 am »
Hi Guys,

I dont know if i have an issue here but...

My dash reads an overall average of 30mpg but when i use an online calculator or calculate it on paper it should actually read far less.

If i put £20 of fuel in at 1.29/litre (standard unleaded) i personally get 80 miles, but if im actually achieving 30mpg i should be seeing 100ish miles.

Could the lost 20 miles be because of starting/idling and similar things or could i have a deeper issue?
Logged

Offline Marc-5-GTI

  • Won't Shut up.
  • *****
  • Thank You
  • -Given: 13
  • -Receive: 26
  • Posts: 549
    • Email
Re: Poor MPG theory doesnt match actual
« Reply #1 on: October 28, 2013, 10:13:28 am »
The electronic read out is never going to be spot on..

If you're really troubled by it though, keep an eye on it.
Logged
3dr Reflex Silver GTI | BBS VZ | Eibach Sportlines | Cumbria

Offline GrayMK5GTI

  • Global Moderator
  • Just look at my post count
  • *
  • Thank You
  • -Given: 125
  • -Receive: 248
  • Posts: 4165
Re: Poor MPG theory doesnt match actual
« Reply #2 on: October 28, 2013, 10:15:37 am »
I think the accuracy can be adjusted with VCDS (Vag Com) if you can work out how far out it is manually.
Logged
NOW: 2015 Golf R DSG 5 Door, Lapiz Blue, 19s, Discover Nav, Reversing Camera
GONE:2007 Black GTI Edition 30 3dr

Offline jakex181

  • Always Involved
  • ****
  • Thank You
  • -Given: 4
  • -Receive: 2
  • Posts: 202
Re: Poor MPG theory doesnt match actual
« Reply #3 on: October 28, 2013, 10:39:17 am »
Ok cheers guys im just going to keep an eye on it for now and maybe start logging my fill ups
Logged

Offline Leigh200sx

  • Always Involved
  • ****
  • Thank You
  • -Given: 7
  • -Receive: 6
  • Posts: 364
    • Email
Re: Poor MPG theory doesnt match actual
« Reply #4 on: October 28, 2013, 10:49:10 am »
Wish mine did 30mpg... I'm sure there is something wrong with It, I've had a Leon Cupra r running 270 Bhp and that was really really good... My gti is doing around 24mpg on the clock and over a long run maybe 30mpg
Logged

Offline SurreyED30

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 37
  • -Receive: 32
  • Posts: 1362
Re: Poor MPG theory doesnt match actual
« Reply #5 on: October 28, 2013, 10:53:53 am »
^ +1 about the golf
Logged
Edition 30 build No:692 Revo stage 2 SOLD
Edition 30 build No:440 Stage 1 SOLD

Offline alexmccabe

  • Always Involved
  • ****
  • Thank You
  • -Given: 14
  • -Receive: 12
  • Posts: 458
    • Alex McCabe
Re: Poor MPG theory doesnt match actual
« Reply #6 on: October 28, 2013, 11:36:37 am »
I get nearly 38MPG+ out of mine on my drives to and from work. I hit up cruise control at 65mph and just relax. Saves me a lot of money. I am still convinced it is not running right as well, so tomorrow it is going to a garage for diagnostics. :) Maybe you should just get a diagnostic scan just to be sure.
Logged


MK5 Golf GTi 197BHP Tornado Red

Offline xjay1337

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 15
  • -Receive: 377
  • Posts: 4916
  • My Ride: http://www.mk5golfgti.co.uk/forum/index.php/topic,88399.0.html
Re: Poor MPG theory doesnt match actual
« Reply #7 on: October 28, 2013, 11:59:08 am »
I get around 36-38 on longer more chilled out drives.
Around 450 to a tank seems quite healthy to me.
Logged

Offline Simon_2.0t

  • Won't Shut up.
  • *****
  • Thank You
  • -Given: 4
  • -Receive: 15
  • Posts: 824
    • Email
Re: Poor MPG theory doesnt match actual
« Reply #8 on: October 28, 2013, 12:00:47 pm »
Quote from: alexmccabe on October 28, 2013, 11:36:37 am
I get nearly 38MPG+ out of mine on my drives to and from work. I hit up cruise control at 65mph and just relax. Saves me a lot of money. I am still convinced it is not running right as well, so tomorrow it is going to a garage for diagnostics. :) Maybe you should just get a diagnostic scan just to be sure.

I was of the understanding using Cruise control not a great way to achieve good MPG as is constantly adjusting the fuel to maintain speed?

38 great figure tho  :happy2:
Logged

Offline GrayMK5GTI

  • Global Moderator
  • Just look at my post count
  • *
  • Thank You
  • -Given: 125
  • -Receive: 248
  • Posts: 4165
Re: Poor MPG theory doesnt match actual
« Reply #9 on: October 28, 2013, 12:04:42 pm »
Quote from: Simon_2.0t on October 28, 2013, 12:00:47 pm
Quote from: alexmccabe on October 28, 2013, 11:36:37 am
I get nearly 38MPG+ out of mine on my drives to and from work. I hit up cruise control at 65mph and just relax. Saves me a lot of money. I am still convinced it is not running right as well, so tomorrow it is going to a garage for diagnostics. :) Maybe you should just get a diagnostic scan just to be sure.

I was of the understanding using Cruise control not a great way to achieve good MPG as is constantly adjusting the fuel to maintain speed?

38 great figure tho  :happy2:

I get roughly the same with or without using Cruise Control  :happy2: Makes a journey so much easier
Logged
NOW: 2015 Golf R DSG 5 Door, Lapiz Blue, 19s, Discover Nav, Reversing Camera
GONE:2007 Black GTI Edition 30 3dr

Offline alexmccabe

  • Always Involved
  • ****
  • Thank You
  • -Given: 14
  • -Receive: 12
  • Posts: 458
    • Alex McCabe
Re: Poor MPG theory doesnt match actual
« Reply #10 on: October 28, 2013, 01:50:33 pm »
Quote from: Simon_2.0t on October 28, 2013, 12:00:47 pm
Quote from: alexmccabe on October 28, 2013, 11:36:37 am
I get nearly 38MPG+ out of mine on my drives to and from work. I hit up cruise control at 65mph and just relax. Saves me a lot of money. I am still convinced it is not running right as well, so tomorrow it is going to a garage for diagnostics. :) Maybe you should just get a diagnostic scan just to be sure.

I was of the understanding using Cruise control not a great way to achieve good MPG as is constantly adjusting the fuel to maintain speed?

38 great figure tho  :happy2:

I actually get less MPG out of it if I don't use the cruise control. It is a lot harder to maintain a constant speed using only your foot. I'd say it's well worth forking out for it if you haven't got it. Might save you some money.
Logged


MK5 Golf GTi 197BHP Tornado Red

Offline jakex181

  • Always Involved
  • ****
  • Thank You
  • -Given: 4
  • -Receive: 2
  • Posts: 202
Re: Poor MPG theory doesnt match actual
« Reply #11 on: October 28, 2013, 02:38:11 pm »
How can i go about getting diagnostics done? do i just take it to any garage or must it be VW?
Logged

Offline dodds-gttdi

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 22
  • -Receive: 34
  • Posts: 1118
  • Edinburgh
    • Email
Re: Poor MPG theory doesnt match actual
« Reply #12 on: October 28, 2013, 03:26:29 pm »
Quote from: jakex181 on October 28, 2013, 10:39:17 am
Ok cheers guys im just going to keep an eye on it for now and maybe start logging my fill ups

A really useful (and free!) app I use is called Roadtrip. Handy wee thing to log all your fill-ups and calculates your MPG, etc, etc.  :happy2:
Logged

Offline alexmccabe

  • Always Involved
  • ****
  • Thank You
  • -Given: 14
  • -Receive: 12
  • Posts: 458
    • Alex McCabe
Re: Poor MPG theory doesnt match actual
« Reply #13 on: October 28, 2013, 04:48:27 pm »
Quote from: jakex181 on October 28, 2013, 02:38:11 pm
How can i go about getting diagnostics done? do i just take it to any garage or must it be VW?

Many garages will charge you a ridiculous amount for it. Best bet is to find someone that can do it for you. There is bound to be somebody in your location that has VAGCOM.
Logged


MK5 Golf GTi 197BHP Tornado Red

Offline Baz300

  • Won't Shut up.
  • *****
  • Thank You
  • -Given: 9
  • -Receive: 26
  • Posts: 707
    • Email
Re: Poor MPG theory doesnt match actual
« Reply #14 on: October 28, 2013, 05:05:52 pm »
Quote from: Leigh200sx on October 28, 2013, 10:49:10 am
Wish mine did 30mpg... I'm sure there is something wrong with It, I've had a Leon Cupra r running 270 Bhp and that was really really good... My gti is doing around 24mpg on the clock and over a long run maybe 30mpg

Have you checked the diverter valve?

My car was getting crap MPG before I replaced the torn one
Logged
Pages: [1] 2 3   Go Up
« previous next »