2003 GU Nissan Patrol Factory Tyres / Fuel Ecom

Submitted: Wednesday, Feb 06, 2008 at 21:40
ThreadID: 54318 Views:2305 Replies:5 FollowUps:1
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Hi all,
Can anyone tell me from their own EXPERIENCE that by changing the tyres on a 2003 Gu 3lt Patrol , 265-70-16 to 265-75-16 will it give better fuel consumption when towing (2 ton) pop top in 3rd or gear (automatic) or even not towing
at the moment on the 265-70-16 I get about 8.2Km per lt (23 mpg) on H'way and around 7.3km per lt (20-21mpg) around town and a 5.8km per lt (16mpg) towing on H/way.

Cheers Lyle
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Reply By: Outbacktourer - Thursday, Feb 07, 2008 at 08:00

Thursday, Feb 07, 2008 at 08:00
I made the change about 4 years ago so the memory has dimmed somewhat. You will feel the difference most in braking although it not so quick off the mark either. Niether are a problem, hust noticeable. I never did the actual calc but I suspect the change cost me in fuel economy but only marginally, perhaps 1L/100Km all round.

AnswerID: 286095

Reply By: Member - AJB (VIC) - Thursday, Feb 07, 2008 at 08:05

Thursday, Feb 07, 2008 at 08:05
It'll change bugger all. All get the same economy give or take half a litre per 100k's. If I push hard I use about 18-19 litres/100k. On the flat and cruising with no wind about 16-17 litres/100k. When not towing I dont really check but I have a rack so dont get as good as others.
I have changed tyre sizes, back and forth, as you have mentioned and if there was a difference in fuel consumption it was not noticable.
AnswerID: 286096

Reply By: Member - Olcoolone (S.A) - Thursday, Feb 07, 2008 at 08:51

Thursday, Feb 07, 2008 at 08:51
Depending on tyre type, they say if you go from HT / AT tyres to muddies your fuel consumption can increase upto 1.5 liters per 100k.

Our fuel comsumption increases by about 1 liter per 100k when going from Cooper ATR's to our Cooper ST/C's with poorer handleing and brakes.

Regards Richard
AnswerID: 286101

Reply By: Chaz - Thursday, Feb 07, 2008 at 10:46

Thursday, Feb 07, 2008 at 10:46
Your fuel consumption will be slightly worst, but I suspect that this is because your speedo will be accurate. Your current figures are based on an inaccurate speedo, but when you go to 265/75’s it should be spot on. Currently, you’re doing less kilometers than your speedo is telling you.
When I went from 70 to 75 aspect, I also went from 11L/100K's to 12L/100K's. It's worth it to have better LT tires.
AnswerID: 286127

Follow Up By: madcow - Thursday, Feb 07, 2008 at 13:06

Thursday, Feb 07, 2008 at 13:06
We've had the same experience and even with 265/75/16's on we are travelling slightly quicker then the speedo using a gps. Only 3km/h at 100 k's.
FollowupID: 551185

Reply By: Robin Miller - Thursday, Feb 07, 2008 at 11:45

Thursday, Feb 07, 2008 at 11:45
Hi Lyle

Asper others it will make little to no difference when you use corrected figures.

Pumping tyres up harder will make more difference. On my patrol I have several sets of wheels including 2 with 255/85/16 .

This tall size does cause a significant lowering of engine revs (5%)
and the potential to use less fuel , but again only if tyres are pumped up hard.
Robin Miller

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AnswerID: 286129

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