Fuel saving measure?

Submitted: Thursday, Jun 22, 2006 at 19:58
ThreadID: 35186 Views:1920 Replies:6 FollowUps:7
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Tyre presures! Geez I can't believe this. I have a VT crapoladore and the front tyres are scrubbing and feathering a bit due to driving through the hills all the time and the rears a scrubbing due to the independant rear end. I thought I'd over inflate them a little - 44 psi to see if I can get them to wear a bit in the middle of the tyre. I haven't noticed much as yet because I've only traveled 1000-1200k's since the inflate but what I have noticed is my fuel eccononomy has dropped. I never have taken to much notice but last tank I had done 700 and something and only put it 62l and today I filled and worked out the mileage and 8.59l/100k. I'm happy to get below 10/100 which I always achieve but since the tyres running at 44psi to save 1l/100 is unbelievable. (no fitch fitted)

Leroy
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Reply By: Member - Oldplodder (QLD) - Thursday, Jun 22, 2006 at 20:03

Thursday, Jun 22, 2006 at 20:03
I was always told the rule of thumb for car tyres is for every 1 psi over 30 psi, you save 2% in less rolling resistance. So 5psi gives you about 10% saving. Max inflation pressure for most car tyres is about 36 psi. 44 psi sounds high. The max pressure is usually on the side of the tyre.
But amazing isn't it!
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Reply By: Member - Axle - Thursday, Jun 22, 2006 at 20:43

Thursday, Jun 22, 2006 at 20:43
HI Leroy.

The rear tyres on the landy ute run on about 44 - 48 psi, but i carry about one ton of gear around all the time!. IF the big BOOM, happens then maybe the economics may not look so good?. Just out of interest a ( CRAPOLADORE) VT".S were a good model so i"m told . Subarus have done me well.

Cheers Axle.
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Follow Up By: Leroy - Thursday, Jun 22, 2006 at 20:49

Thursday, Jun 22, 2006 at 20:49
the tyre are scrubbing out anyway so if the go 'BOOM' no matter....nothing ventured as they say.

Leroy
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Follow Up By: F4Phantom - Thursday, Jun 22, 2006 at 22:34

Thursday, Jun 22, 2006 at 22:34
When you dress up a commonwhore, you can be sure it still the same under the new skin. Every time a new model comes out I have a drive and realise that for a big powerful 6 cylinder car atr only 35k you get bang for buck, but refinement is not part of the equation.
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Reply By: Barnray - Thursday, Jun 22, 2006 at 21:13

Thursday, Jun 22, 2006 at 21:13
Wear patterns on radial tyres are the reverse when over inflated ie the outside edge will wear more than the centre. Barnray
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Follow Up By: Leroy - Friday, Jun 23, 2006 at 06:23

Friday, Jun 23, 2006 at 06:23
8-O are you sure?

Leroy
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Follow Up By: fisho64 - Friday, Jun 23, 2006 at 10:13

Friday, Jun 23, 2006 at 10:13
doesnt sound right to me?
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Follow Up By: Leroy - Friday, Jun 23, 2006 at 11:18

Friday, Jun 23, 2006 at 11:18
i know, hence me question....

Leroy
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Reply By: Member - Bradley- Friday, Jun 23, 2006 at 00:48

Friday, Jun 23, 2006 at 00:48
regardless of pressure, vt commys are chronic tyre scrubbers, fronts always chew the outside edge and rear chews the inner edge to various degrees, whiteline and others do kits to fix up the rear, but the front never seems to be fixed up properly.

i find around 38 on the standard tyres is a good mark.

And yes pumping em up will save on the juice. although it will accellerate centre tread wear, but if you rotate front to rear then the sides will be scrubbed down and so this wont matter :-)
AnswerID: 179996

Follow Up By: Leroy - Friday, Jun 23, 2006 at 06:22

Friday, Jun 23, 2006 at 06:22
'although it will accellerate centre tread wear'

Yeh I realise this but they are at a point where they are/will be stuffed regardless if I do nothing as I have been rotating front to rear.

I usuall run 38 and have from new but as the ol girl ages she's being harder and harder on tyres. At this late stage of the game I'm not worring about getting kit for rear as it's done 180k now and the next set of tyre will see it out.

Leroy
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Reply By: fisho64 - Friday, Jun 23, 2006 at 01:49

Friday, Jun 23, 2006 at 01:49
Beware that overinflating tyres greatly reduces the traction, especialy in the wet.
As it reduces the footprint of the tyre, opposite of underinflating in sand.
can be real dangerous in the wet
AnswerID: 179999

Follow Up By: Member - Oldplodder (QLD) - Friday, Jun 23, 2006 at 08:04

Friday, Jun 23, 2006 at 08:04
Yeah, are a bit slippier on high pressures in the wet, but it is fun on the roudabouts steering with the throttle, that is if you don't slide through them first trying to slow down. Not speaking from experience of course :-))
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Reply By: Flash - Friday, Jun 23, 2006 at 13:14

Friday, Jun 23, 2006 at 13:14
Leroy,
what you mean is your economy has INCREASED, your fuel consumption has decreased.
And higher tyre pressures do not necesarily mean worse handling in the wet- it actually decreases the chance of aquaplaning- aquaplaning speed is directly proportional to tyre pressure.

Upping tyre pressures (within reason) will help handling, fuel economy, and tyre life.
The only negative is ride quality, and the manufacturers figures always err on the side of ride quality. I have always used higher than manufacturers figures on bitumen, (obviouly not on dirt/ sand etc)

AnswerID: 180063

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