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Economy MPG?


 
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delart



Joined: 21 Feb 2008
Posts: 290
Location: Powys

PostPosted: Sat Nov 03, 2018 10:04    Post subject: Economy MPG? Reply with quote

Hi I made the stupid decision to monitor my MPG 2.8 TD used mostly very short distances and left running to warm up in the recent frosty mornings with Kumho KL71's on 160Kms for 34 litres of diesel with my maths works out just over 13 to gallon Shocked car has been mot'd recently?
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PostPosted: Sat Nov 03, 2018 10:04    Post subject: Google Ads keep this community free to join!


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Lewis
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Joined: 25 May 2006
Posts: 16291
Location: Huddersfield

PostPosted: Sat Nov 03, 2018 14:22    Post subject: Reply with quote

hmmm

4.456 litres = 1 UK Gallon

(160÷34) x 4.456 = 17.985 Mpg.   Wink

It's the crap UK fuel, which I don't think is as good as what they supply in Europe.
I was getting an average of 30 Mpg whilst driving in Spain and France and then dropped down to 22'ish after getting back and filling up at Sainsbury's.  Evil or Very Mad
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Deker



Joined: 08 Mar 2008
Posts: 3833
Location: Borehamwood

PostPosted: Sat Nov 03, 2018 19:13    Post subject: Reply with quote

Sorry Lewis  Sad

I think I have to agree with delart.
Using only two decimal places, I arrive at 13.6 MPG

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Lewis
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PostPosted: Sat Nov 03, 2018 19:15    Post subject: Reply with quote

Not my maths! It was done in an excell spreadsheet.  Rolling Eyes
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Deker



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PostPosted: Sat Nov 03, 2018 19:29    Post subject: Reply with quote

Who programmed   Rolling Eyes  the Excel sheet  Question

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Lewis
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PostPosted: Sat Nov 03, 2018 19:35    Post subject: Reply with quote

Dunno it was got off the internet.

When I did it with a calculator I got 160 divided by 34 = 4.705.  4.705 x 4.456 = 20.965, which is even higher.  Laughing
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jaspa



Joined: 27 Apr 2018
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Location: Gatwick

PostPosted: Sat Nov 03, 2018 20:22    Post subject: Reply with quote

It's 160 KMs, not miles listed in the initial post  Wink

Stuart
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Lewis
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PostPosted: Sat Nov 03, 2018 20:37    Post subject: Reply with quote

Ah, spotted what is wrong with the Excel spreadsheet. There was a column missing.

The 20.965 I got with the calculator needs dividing by 1.6 (Km to a Mile) to give 13.103.  :D
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Green Grouch
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Joined: 14 Feb 2012
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Location: Dorset

PostPosted: Sat Nov 03, 2018 22:36    Post subject: Reply with quote

13mpg in this weather with short runs and warm ups could well be right  Sad

You need to get some averages over some time.

My diesel did 22 average on a longer run and it was looked after, oil regular,  air filters etc. Timing chain.  

Lots of variables, tyres, wheel size, are brakes not sticking a bit.?  The way you drive? Load?

I've heard of lots of big Mileage claims but they are heavy and old Sad
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andyman



Joined: 08 Dec 2012
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Location: Penrith

PostPosted: Sun Nov 04, 2018 1:11    Post subject: Reply with quote

The bigger your wheels/tyres are, the further you travel in a recorded mile or km. So you will get fewer recorded mpg for the same actual distance travelled.
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Fostlongstrider
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Joined: 03 Mar 2008
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PostPosted: Sun Nov 04, 2018 10:13    Post subject: Reply with quote

I get 22-23 mpg running around and 27-28 mpg on a long run cruising at 60 mph.

I use the more accurate 4.54 litres to the gallon which I get from all my conversion tables!!
Not really worth going to 3 decimal places.
Rough guide is 4.5 litres to the gallon.
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delart



Joined: 21 Feb 2008
Posts: 290
Location: Powys

PostPosted: Sun Nov 04, 2018 10:57    Post subject: Reply with quote

Thanks guys I thought it was about right um to thirsty what to do now the Kumho KL71 are F/G economy rating if I change to the   BFGoodrich Urban Terrain T/A 235/75 R15 109 H XL that are C economy rated what if any improvement could I hope to see? Any guesses ?
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Green Grouch
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PostPosted: Sun Nov 04, 2018 12:45    Post subject: Reply with quote

Personally,  I don't think you will see any massive change at all.
Perhaps if you did 50k miles a year you might notice something, but short journeys are not their strongpoint.  

Quoting 'Divers' signature,  if mpgs your thing,  a Delica isn't Sad
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delart



Joined: 21 Feb 2008
Posts: 290
Location: Powys

PostPosted: Sun Nov 04, 2018 13:33    Post subject: Reply with quote

Yeah I know, but have had the Delica for twelve years or so, but it was used a lot more for towing etc and lives change but still reluctant to get rid  :D a
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andyman



Joined: 08 Dec 2012
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Location: Penrith

PostPosted: Sun Nov 04, 2018 20:05    Post subject: Reply with quote

I understand your concern for economy. I use mine most in the summer, and for load shifting and bad weather occasionally in the winter. With diesel prices rising, you could try running a few litres of cooking oil through it, but with cold weather coming, keep it to max 25 - 33% of your tank, and add 1litre of petrol for every 20L of cooking oil, preferably pre-mixed to reduce the chance of the cooking oil waxing if the temperature drops below 2C. 20L of cooking oil, even at £1.10/L, is going to save you £5 on 20L diesel equivalent.
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delart



Joined: 21 Feb 2008
Posts: 290
Location: Powys

PostPosted: Mon Nov 05, 2018 20:13    Post subject: Reply with quote

Thanks Andyman have got ten litres of oil was seven pounds so will give it a go Wink
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richjp



Joined: 22 Jan 2018
Posts: 85
Location: Walthamstow

PostPosted: Fri Sep 25, 2020 17:24    Post subject: Reply with quote

Been monitoring my new 3.0L V6 petrol for a while now and concur with Lewis - Sainsbury's fuel is crap ;)

I'm getting 17 (city) -20 (mix with motorway) mpg with their fuel but if I put some nice 97 octane stuff in it I can get 27-28mpg on the motorway. You pays your money and all that........
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b3lha



Joined: 06 Jun 2015
Posts: 51
Location: Redhill

PostPosted: Fri Oct 16, 2020 22:02    Post subject: Reply with quote

Yep. 15-20 sounds about right for a V6 driven gently in RWD. If you put the 4WD on and drive it like a rally car then it's more like 10-15.

I find I can save a lot of money by driving at 50-60 rather than 80.
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richjp



Joined: 22 Jan 2018
Posts: 85
Location: Walthamstow

PostPosted: Fri Oct 23, 2020 11:37    Post subject: Reply with quote

Yeah same - 50-60 on the motorway saves a lot of £!
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