 | Home > Td5 > Wheres my fuel going? |
 
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443   
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Changing the tyres will have affected the milometer, the bigger diameter will give a lower mileage reading than the 205's and if you have based your calculations on the clock on the speedo then that could account for the discrepancy.
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27th Feb 2014 5:02pm |
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| VeeTee Member Since: 06 Mar 2011 Location: Somewhere Posts: 1512 
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Assuming you first had 205/80x16 and now 265/70x16, the difference in circumference is 5.86%. So in reality you do 24 x 1.0586 = 25.4 mpg.
You loose some efficiency because of the increased resistance of the bigger tyres, and some is lost because of the modified air intake and light bar. My 300 Tdi has 265/70x16 tyres also, as wel as a snorkel and roofrack. In cold weather in the winter approx. 25 mpg is normal, in the summer it is a bit better, approx. 28 mpg. Cheers, Vincent 1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold) 1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold) 1975 Series III 88 V6, Light Green (sadly sold) 1996 Defender 110 CSW 300 Tdi, Epsom Green (sold) 2000 Freelander 1 TD4 3-drs, Silver (sold) 2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold) MySite |
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27th Feb 2014 7:27pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5653 
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What miles per tank are you getting please.
Andy |
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27th Feb 2014 8:35pm |
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| Lou Sparts Member Since: 15 Apr 2012 Location: Kent Posts: 1501  
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My Td5 does about 285 miles to the fuel light coming on about 310 to getting nervous ! 2005 Td5 90 XS
Steve |
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27th Feb 2014 9:00pm |
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| Millsy94 Member Since: 06 Jun 2013 Location: Gloucestershire Posts: 91 
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You find summer better than winter for mpg? I was getting 360 to a tanks now 240-280 hope it'll return in the spring also got overdrive but hoping that'd improve it
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27th Feb 2014 9:22pm |
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| Millsy94 Member Since: 06 Jun 2013 Location: Gloucestershire Posts: 91
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is your 90 standard? |
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27th Feb 2014 9:29pm |
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| Lou Sparts Member Since: 15 Apr 2012 Location: Kent Posts: 1501
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Yes bog standard as far as i know, Running 235 85 16 BFG AT,s mostly just local running around to and from work.
Does less if used on motorway at speed as you would expect. 2005 Td5 90 XS Steve |
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27th Feb 2014 9:34pm |
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| Millsy94 Member Since: 06 Jun 2013 Location: Gloucestershire Posts: 91
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Same rolling circumference as me then really, I don't do too much motorway speed though I did find doing 95 really sunk the fuel may disconect snorkel to see any change
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27th Feb 2014 9:37pm |
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| Lou Sparts Member Since: 15 Apr 2012 Location: Kent Posts: 1501
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oh yes forgot to mention i have an RAI. 2005 Td5 90 XS
Steve |
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27th Feb 2014 9:53pm |
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| I.AM_a driver Member Since: 11 Jun 2009 Location: Edinburgh, Scotland Posts: 404  
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I get about 300 ish miles out of a tank, but I've a Patriot rack and safari RAI, but standard engine/gearbox/suspension with 265x75r16 ATs.
I'd have expected better mpg in the winter, due to more dense fuel when dispensed, and more dense air for the combustion cycle, but these are Land Rovers after all. Mark S CONVOY for HEROES www.facebook.com/convoy4heroes www.lothian4x4response.org ------ Td5 90 Thread in 'My Defender' Forum |
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27th Feb 2014 10:07pm |
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| VeeTee Member Since: 06 Mar 2011 Location: Somewhere Posts: 1512
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fuel economy winter vs summer Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold) 1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold) 1975 Series III 88 V6, Light Green (sadly sold) 1996 Defender 110 CSW 300 Tdi, Epsom Green (sold) 2000 Freelander 1 TD4 3-drs, Silver (sold) 2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold) MySite |
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27th Feb 2014 10:14pm |
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| me@td5.org Member Since: 16 Jan 2011 Location: Warwick Posts: 856 
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I obviously need to slow down. I am happy with 20mpg. www.td5.org
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27th Feb 2014 10:44pm |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443
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I'm with Mark with the fuel consumption being better in the colder weather in the winter, the whole object of our diesel engines having intercoolers fitted is to try to keep the air temperature cooled after being compressed with the turbo. So if the ambient air is cooler in the first place then there is hope that the air entering the combustion chamber is cooler than in summer, not by a huge amount but cooler. There is the chance of wetter conditions which does make a difference, but it can be noticeable on a dry cold frosty morning when your motor seems to run better.
The link posted above is geared mainly to petrol and lpg engines, and Americans. |
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27th Feb 2014 11:32pm |
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| Interlet Member Since: 10 Oct 2011 Location: Norwich Posts: 461 
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My TD5 did 25mpg whether I cained it, sat at 50, Summer, Winter, off road, you name it, it averaged 25mpg all the time. I really found it bizarre, I calculated every single tankful, and it ranged from about 24.7 to 25-8mpg. That is obviously within a margin of error, but basically it was 25.
My 300 on the other hand fluctuates wildly. In the Summer, I was getting 28-29 on almost every trip. I did not have a roof rack on back then though. In the winter, before roof rack, I had about low 27s, with roof rack it's about 26. I commute regularly through several villages, with a lot of 30 limits, slowing down for tractors, which probably brings it down a bit more, but on a 500 mile run up to Newcastle and back in November, (took rack off for the trip) I estimate the motorway journey, I got about 29.8. 1998 110 300Tdi White Hard Top |
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27th Feb 2014 11:33pm |
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