Better mpg on normal unleaded compared to super?

[jaded2882 0]

I have run my G60 on super unleaded (usually Tescos 99 or V-power) for the last 2 years, pretty much since the mods took it over 200bhp. I have never had better than 31mpg out of it according to the MFA in that time, and that was with plenty of coasting down hills and general boring driving! Usual spirited A road driving gives 23-25mpg

 

I couldn't get any super last night and filled up with standard Tesco unleaded as I had to drive from Bewdley to Brecon. Admittedly I did get stuck behind slow cars a lot of the way so spent it doing about 50mph in 5th, but my MFA showed 35mpg! On the way back this afternoon I gave it some welly for extended periods and spend the rest of the time at 60-70, and it still showed 33mpg over the journey!

 

I guess the only way to really test it is with the fill up and measure method as I guess the MFA may be misreading? Just wondered if anyone else has had anything similar happen. Are the statements about super giving more miles per tank a load of balls?!

[Jim 2]

My G60 MFA always used to say the same and I've no idea if it was truth or lies - I never measured it. As you say, best thing to do is manual calculation - be interested to hear what you find though! :)

[boost monkey 0]

The MFA is a rough estimation at best. Here's how I calculate my mileage:

 

Brim the tank,

Drive for however far you like, the further the better as the average mpg will be more accurate,

refill the car to brimming,

note down the speedo trip counter for the mileage you have done between fill ups,

using the petrol receipt work out the miles per gallon. I use 4.5454545454... for litres per gallon, then divide total mileage by that gallon figure.

 

Hope that helps.

[dragon green 5]

I do the same as Mr.Boost Monkey,

It's the most accurate way !

[davidwort 0]

Then take off 10% for speedo inaccuracy :)

[dalhalvaig 0]

I too am a fuel consumption anorak. There I said it.

 

Similar method to boost monkey, but I use the odometer reading rather than trip. I plug it all into a spreadsheet. It give me graphs and everything. I also note the MPG from the MPG2 setting on the MFA, and reset that when I fill up - after writing down the number. I've been amazed how close the MFA MPG2 and the calculation are - within 0.5mpg a lot of the time. On my Touran, the MFA is between 5 and 10MPG optimistic.

 

If anyone wants the spreadsheet then PM me

 

D

[moneypit23 0]

I'm convinced i got slightly better mpg with Esso super unleaded last week. I based this solely on the MFA but surely if the MFA is incorrect it is still consistent?

[dannyboy 0]

My G60 gets better MPG during summer with V-power or BP Ultimate 102 only when its very hot.during the colder weather i run it on normal 95 because i swear that higher octane fuel cools engine more.

 

Im sure G60s are supposed to run hot anyway and they dont really advance the timing as much as newer engined cars so you wont really get full use of higher octane fuel.

Unless your G60 is mapped to run higher octane and more igintion advance then you wont really see a benefit

[boost monkey 0]

My fuel economy has jumped 4mpg from 32 to 36 on average since I got the cambelt done. Shows how important it is that your engine is timed well, and as mentioned above shows that sometimes you won't be using the extra octane unless it's been modded too....God knows how far out my timing was with the old belt!

 

btw this is on the Golf.

[yacobwood 0]

I close my eyes and hold the petrol pump till it clicks then pay by card hopefully not catching a glimps of the total figure.... =/

[VAG-hag 0]

I close my eyes and hold the petrol pump till it clicks then pay by card hopefully not catching a glimps of the total figure.... =/

 

same!!

[mrginge 0]

You can be stood there for so long though.

 

Are the pumps for super slower then normal?!

[Alex_G60_Fanatic 0]

You can be stood there for so long though.

 

Are the pumps for super slower then normal?!

I've noticed this... It takes ages to fill your tank campared to say a few years ago... do you think that it's limmitted to Litres per pence? so you can keep and eye on the value your putting in it?

[Pat_McCrotch 0]

Is the G60 designed to run on 98ron+ then?

[owen g60 10]

yes they are recommended to run on it.

 

mine still has the original label on the inside of the fuel filler... recommends 98 ron but will run on 95

[wy906 0]

I keep a spreadsheet. I'm sad.

 

Date Mileage Litres Cost £/L

1 17/04/2010 Total regular 76,016 53.33 £63.94 £1.199

2 22/04/2010 Shell V-Power 31.52 £40.00 £1.269

3 25/04/2010 Shell V-Power 23.65 £30.01 £1.269

4 01/05/2010 Shell V-Power 76,704 23.64 £30.00 £1.269

5 08/05/2010 Shell V-Power 76,870 23.64 £30.00 £1.269

6 13/05/2010 Shell V-Power 77,033 31.52 £40.00 £1.269

7 22/05/2010 Shell V-Power 77,156 33.09 £41.00 £1.239

8 30/05/2010 Shell V-Power 77,307 28.71 £35.00 £1.219

9 05/06/2010 Shell V-Power 77,483 32.81 £40.00 £1.219

10 12/06/2010 Shell V-Power 77,642 32.81 £40.00 £1.219

11 17/06/2010 Shell V-Power 77,782 47.23 £58.05 £1.229

12 24/06/2010 Shell V-Power 78,064 41.50 £51.00 £1.229

13 08/07/2010 Shell V-Power 78,406 40.68 £50.00 £1.229

14 21/07/2010 Shell V-Power 78,757 24.81 £30.00 £1.209

15 31/07/2010 Shell V-Power 78,898 24.81 £30.00 £1.209

16 14/08/2010 Shell V-Power 79,043 12.41 £15.00 £1.209

17 18/08/2010 Shell V-Power 79,094 33.36 £40.00 £1.199

18 04/09/2010 Shell V-Power 79,260 21.87 £26.00 £1.189

19 11/09/2010 Shell V-Power 79,432 58.87 £70.00 £1.189

20 22/09/2010 Shell V-Power 79,708 33.09 £40.01 £1.209

21 02/10/2010 Shell V-Power 79,956 25.43 £31.00 £1.219

22 07/10/2010 Shell V-Power 80,098 26.25 £32.00 £1.219

23 17/10/2010 Shell V-Power 80,250 26.04 £32.00 £1.229

24 23/10/2010 Shell V-Power 80,340 25.83 £32.00 £1.239

25 03/11/2010 Asda unleaded 80,532 4.00 £4.64 £1.160

26 03/11/2010 Shell V-Power 80,535 40.03 £50.00 £1.249

27 06/11/2010 Shell V-Power 80,573 35.74 £45.00 £1.259

28 12/11/2010 Shell V-Power 80,686 18.87 £23.00 £1.219

29 24/11/2010 Shell V-Power 80,999 23.64 £30.00 £1.269

30 29/11/2010 Shell V-Power 81,107 31.52 £40.00 £1.269

31 08/12/2010 Shell V-Power 81,222 30.49 £39.00 £1.279

32 12/12/2010 Shell V-Power 81,439 30.49 £39.00 £1.279

33 16/12/2010 Shell V-Power 81,510 26.58 £34.00 £1.279

34 20/12/2010 Shell V-Power 81,538 17.40 £22.60 £1.299

35 22/12/2010 Shell V-Power 81,577 7.47 £9.70 £1.299

36 28/12/2010 Shell V-Power 81,833 19.25 £25.01 £1.299

37 29/12/2010 Shell V-Power 81,927 43.11 £56.00 £1.299

38 02/01/2011 Shell V-Power 82,299 62.64 £82.00 £1.309

39 22/01/2011 Shell V-Power 82,594 30.39 £41.00 £1.349

40 05/02/2011 Shell V-Power 82,747 18.53 £25.00 £1.349

41 06/02/2011 Shell V-Power 82,927 11.12 £15.00 £1.349

42 12/02/2011 Shell V-Power 82,976 58.56 £79.00 £1.349

43 14/02/2011 Texaco 97 83,212 10.80 £15.00 £1.389

44 20/02/2011 Shell V-Power 83,302 14.84 £20.02 £1.349

45 27/02/2011 Shell V-Power 83,336 51.88 £70.50 £1.359

46 01/04/2011 Shell V-Power 83,507 31.23 £37.50 £1.201

47 09/04/2011 Shell V-Power 83,857 30.30 £43.00 £1.419

48 16/04/2011 Shell V-Power 83,926 30.10 £43.01 £1.429

49 30/04/2011 Shell V-Power 84,174 30.58 £44.00 £1.439

50 13/05/2011 Shell V-Power 84,233 32.78 £47.50 £1.449

51 25/05/2011 Shell V-Power 84,533 46.56 £67.00 £1.439

52 29/05/2011 BP 84,750 10.43 £15.01 £1.439

53 30/05/2011 Shell V-Power 84,924 49.34 £71.00 £1.439

54 05/06/2011 Shell V-Power 85,017 15.29 £22.00 £1.439

55 13/06/2011 Shell V-Power 85,238 15.29 £22.00 £1.439

56 26/06/2011 Shell V-Power 85,285 17.50 £25.01 £1.429

57 02/07/2011 Shell V-Power 85,405 16.68 £23.50 £1.409

58 14/07/2011 Shell V-Power 85,596 17.64 £20.00 £1.134

59 23/07/2011 Shell V-Power 85,647 16.20 £22.99 £1.419

60 05/08/2011 Shell V-Power 85,753 15.51 £22.01 £1.419

61 12/08/2011 Shell V-Power 85,826 22.55 £32.00 £1.419

 

Total Mileage 9,810

Litres 1742.23

Gallons 383.24

Cost £2,250.01

 

MPG 25.60

Cost per mile £0.23

Mile per £ 4.36

[dannyboy 0]

Is the G60 designed to run on 98ron+ then?

 

Depends on the ECU,different countries ran different maps to counter lower octane fuel.But thats if its a standard map which 99% of g60s arent.

 

91 is the minimum (no longer sold in europe now)

95 is reduced power

98 gives you full power.

anything over 98 is pretty much wasted. pay for higher octane fuel and still run like its on 98.unless of course your car has been mapped to run the higher octane

 

small expections are stuff like E10 we have over here which basicly 10% alcohol,90% petrol.Ive tested every type of petrol over here to see how it run in all types of weather

My G60 loves E10 stuff,runs like its on 98 but you have to be careful as the high alcohol content can eat through older rubber hoses!

[boost monkey 0]

My 8v golf has a label in the fuel filler saying 97/98 RON only, but also a sticker on the slam panel under the bonnet saying that the ignition timing has been altered so that it can run on 95RON! :lol:

[yacobwood 0]

I keep a spreadsheet. I'm sad.

 

Date Mileage Litres Cost £/L

25 03/11/2010 Asda unleaded 80,532 4.00 £4.64 £1.160

26 03/11/2010 Shell V-Power 80,535 40.03 £50.00 £1.249

 

Were you running a bit low on fuel on row 25 :lol: £4 of normal fuel in and covered 3 miles till £50 worth of vpower went in :lol:

[eurospec 10]

Was gonna say, aren't they all supposed to be run on 98RON?

 

My 1.8 16v has 98RON on the filler flap, and my friends 2.0 16v and G60 do also....

[dalhalvaig 0]

Was gonna say, aren't they all supposed to be run on 98RON?

 

My 1.8 16v has 98RON on the filler flap, and my friends 2.0 16v and G60 do also....

 

"Spock! Analysis!"

 

"Well Captain. Whatever the earthling is using to fuel his intergalatic VR6, it is getting more expensive"

 

"Scotty, get to Tesco's and buy some Robinsons Squash and get 5p off a litre"

 

Anyway...I'm getting an average of 29.7mpg, £0.20/mile after 4423 miles since January

 

Currently running at about 30-32 per fill compare to 25mpg back in February

[Toohottotrot 10]

I bought 2 of those squash to get the 5p off........it tastes like crap, I'd rather drink the 98RON!!!!!

[dannyboy 0]

the only problem is people seem to think the higher the octane number the better the fuel from cheaper outlets.far from the truth.octane only denotes the knock resistance. The fuel is still the same crap tescos or sainsbury's have on sale just with extra additives like ethanol(alco).basiclly it artifically raises the octane number but same amount of sulphur and other crap in cheaper fuels.So your fuel mileage maybe better with normal stuff because it dosent contain lower calorific value additives

 

Stuff like V-power is refined at the higher octane level rather than artifically raising it.Removing most of the crap and sulphur takes longer to refine hence the reason why its more expensive.Really,You get what you pay for.

 

only problem is that higher octane fuels work really well for modern cars.Lets face it the injection systems in these cars are well old and managment systems that are very basic.Yes they work well when in parameters,but they are limited and crude type of injection.

 

---------- Post added at 08:39 PM ---------- Previous post was at 08:37 PM ----------

 

I bought 2 of those squash to get the 5p off........it tastes like crap, I'd rather drink the 98RON!!!!!

Quality :lol:

[wy906 0]

Were you running a bit low on fuel on row 25 :lol: £4 of normal fuel in and covered 3 miles till £50 worth of vpower went in :lol:

 

Let’s just say it was an emergency and I was 3 miles away from the nearest Shell station. :D