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Author Topic: Do higher tire pressures help mpg? Back to Topics
iaqxf
Rookie Author
Ohio

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Message Posted: May 19, 2011 6:29:26 AM


.............................................

tires at 10psi = 3.7% increase in consumption

tires at 30psi = 1.2% increase in consumption

Control, 35psi (manufacturer recomendation)

tires at 40psi = 6.2% decrease in consumption

tires at 60psi = 7.6% decrease in consumption

From Mythbusters test....


[Edited by: iaqxf at 5/19/2011 6:31:29 AM EST]
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drydem
Veteran Author Maryland

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Message Posted: Mar 4, 2015 7:58:03 PM

btw: low rolling resistance tire do their magic with the roads are dry and smooth. If the roads surfaces are rough with debris or potholes, if the road is wet, icy, or covered with snow OR if roads are graded for traction like mountain side roadways THEN low rolling resistance tires and high tire pressures isn't going to help increase fuel efficiency.
drydem
Veteran Author Maryland

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Message Posted: Mar 4, 2015 7:44:59 PM

Higher tire pressure helps lowers the tire's rolling resistance which is the main energy cost for moving a truck forward under 20 mph and to move a car forward under 40 mph. Add low rolling resistance tires (like Goodyear Fuel Max or Bridgestone Ecopia )and a skilled hypermiling driver with higher tire pressure and this can help boost a vehicle's MPG by over 20% in the summer time. Usually any pressure setting within + or - 5 psi of the maximum tire pressure printed on the side wall of the tire should not cause the tire to prematurely wear or grow old. Most car manufactures recommend tire pressures that are 5 to 10 psi less than the maximum tire pressure on the side wall of the tire so that the tire absorbs some of the road shock/vibrations. As the tire pressure approaches the maximum tire pressure as stated on the sidewall of the tire - more and more road vibration/shockwaves will be transmittted from the tire into the car and steering column - making the ride much harsher when the road surfaces are rough ... As the speed of a truck goes over 35 mph and as the speed of a car goes over 55 mph - the major energy cost for moving forwaard becomes aerodynamic drag and value of low rolling resistant tires become less and less important to fuel usage.

I've done my research and verified the above concepts in the real world. and I've been able to get +70 mpg on a 2010 Prius in the summer time. I'm one of the few drivers listed in t he 3rd gen Prius 800 mile club and I'm in the top 40 for high MPG records in Priuschat.

[Edited by: drydem at 3/4/2015 7:52:27 PM EST]
Glasman
Champion Author South Carolina

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Message Posted: Mar 4, 2015 10:27:15 AM

yes, but the tires do not last very long..
JohnCur
All-Star Author New Jersey

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Message Posted: Mar 4, 2015 8:23:50 AM

yes
Mahalo5
Veteran Author Philadelphia

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Message Posted: Mar 4, 2015 7:51:24 AM

It may help mpg's but in the long run it shortens the life of the tire. That's what some car people have said. Who really knows.
iamjoekewl
Rookie Author New York

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Message Posted: Mar 3, 2015 11:28:51 PM

yes
pt1KY
Champion Author Lexington

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Message Posted: Mar 3, 2015 4:51:30 PM

Yes
ShortyT2014
Rookie Author Lexington

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Message Posted: Mar 3, 2015 12:02:16 PM

Yes
xmstr
Rookie Author Michigan

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Message Posted: Mar 2, 2015 7:05:05 AM

No
GLM4205
Champion Author Toledo

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Message Posted: Mar 2, 2015 6:23:25 AM

Per manfacturer's recommendations.
hoopitup2000
Champion Author Virginia

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Message Posted: Mar 1, 2015 9:35:52 PM

yes
eccerr0r
Champion Author Fort Collins

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Message Posted: Mar 1, 2015 10:10:09 AM

Sure, let's trade off fuel economy for safety.
Then again, too low of pressure can also increase chance of tire failure too.
dontuknowOH
Champion Author Ohio

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Message Posted: Feb 28, 2015 12:36:30 AM

Yes, any lower pressure than what is proper tire pressure in all 4... tires, really wastes fuel mileage at any speed, even starting motion each time, also wastes when resuming back up to travel speed.

Any low inflated tire constantly hampers motion, by resisting rolling motion, almost similar to having a brake force turned on then creating a drag load. A visual check often is a cheap fix to save against worse fuel consumption. Air of course won't jump into the low tire just by looking at it.

Also if driving highway speeds over longer distances a low tire if mounted to the vehicles drive axle, that can cause extra stress/heat build up in the differential drive gears FWD or RWD, depends on where the low tire is in use. A 15---20# lower pressure tire, under inflated for example (very noticeable. Just do a visual check often, that saves $$$ later on!
ray44512
Veteran Author Ohio

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Message Posted: Feb 27, 2015 8:50:49 PM

Yes.
poetdog73
Champion Author Toledo

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Message Posted: Feb 26, 2015 10:15:02 AM

don't know
badbobKY
Champion Author Lexington

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Message Posted: Feb 26, 2015 10:05:19 AM

no
gvan
Champion Author Chicago

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Message Posted: Feb 26, 2015 9:21:53 AM

"Add a moderate increase of PSI for better edfficiency. Be sure to check the sidewall for info."

Be sure to check the owners manual or the placard on the driver door jamb for proper PSI....not the tire. A few pounds over the recommended pressure should not be a problem for handling or braking.
borego
Rookie Author Sarasota

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Message Posted: Feb 26, 2015 7:40:39 AM

depends on your tires and speed
dontuknowOH
Champion Author Ohio

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Message Posted: Feb 26, 2015 5:46:50 AM

I just try to stay within 2-3# of the max rating on the tire, running good tires. No problems yet on any of Our vehicles, past/present! Better MPG's!
nru
Champion Author Twin Cities

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Message Posted: Feb 25, 2015 10:49:33 PM

Better mileage - longer stopping distance and less steering control
gas2guzz
Sophomore Author New Jersey

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Message Posted: Feb 25, 2015 7:47:58 PM

slightly
PaylessKY
Champion Author Kentucky

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Message Posted: Feb 25, 2015 2:54:04 PM

Use the size tires your vehicle came with, and check the tire placard for proper psi.
cheapmonkee
Champion Author Portland

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Message Posted: Feb 25, 2015 2:13:05 PM

Add a moderate increase of PSI for better edfficiency. Be sure to check the sidewall for info.
jameskel
Rookie Author Washington

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Message Posted: Feb 18, 2015 5:03:14 PM

I always go with what the TIRE manufacturer says on the tire, not what the car maker wrote in its manual 20 years (and 8 sets of tires) ago.

James
Houckster
Champion Author Atlanta

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Message Posted: Feb 13, 2015 3:45:16 PM

One poster writes: this true, I should over-inflate?... makes sense, physically, but suspect risks outweigh this reward
______
Inflating a tire a bit over the OEM recommendation will not increase risk in any significant way. Tires that are a bit overinflated relative to the OEM recommendation allow the car to handle better. Some are concerned about a reduced treadprint leading to reduced braking, especially in a hard stop situation. This is untrue because the rapid stop will throw more weight on the front tires increasing their footprint.

I run my tires at 8 PSI above the OEM recommendation in the back and 12 PSI over on the front tires. I've never had a problem. And the tire wear? I have almost 54K on the tires and they look good for another 25-30K more.

The front tires should have a higher PSI than the rear tires because they must bear more weight and as a result, they don't distort as much, especially in turns.

Of course, NEVER inflate the tire above the maximum inflation level shown on the tire's sidewall.
dontuknowOH
Champion Author Ohio

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Message Posted: Feb 11, 2015 10:26:12 PM

Recently I have spotted many cars with at least one low inflated tire. Each time the Wife and I drive locally to shop or eat out, we see at least three vehicles running a low tire(excessive footprint). That is a big fuel waster, usually the rear tire, tires.
drydem
Veteran Author Maryland

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Message Posted: Feb 11, 2015 7:18:22 PM

Higher tire pressures helpa a car coast farther on momentum so if the driver pulses the accelerator and then allows the car to coast on momentum for a long time and if the driver coast to a stop rather than accelerates towards a stopping point .... the car's MPG up...

Mininana
All-Star Author New York

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Message Posted: Feb 11, 2015 6:39:22 PM

this true, I should over-inflate?... makes sense, physically, but suspect risks outweigh this reward

[Edited by: Mininana at 2/11/2015 6:39:42 PM EST]
speedy_911
Champion Author Phoenix

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Message Posted: Feb 11, 2015 4:06:37 PM

Yes...
Mikeyy1960
All-Star Author Cape Coral

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Message Posted: Feb 11, 2015 2:57:46 PM

to just answer the question: yes they do.
eyegotgas2
Champion Author British Columbia

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Message Posted: Feb 11, 2015 3:14:13 AM

I believe so
ray44512
Veteran Author Ohio

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Message Posted: Feb 11, 2015 1:06:37 AM

Yes, rolling resistance is reduced.
hoopitup2000
Champion Author Virginia

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Message Posted: Jan 18, 2015 11:09:22 PM

Yes
GLM4205
Champion Author Toledo

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Message Posted: Jan 18, 2015 9:50:57 PM

I fill my tires, at the manufacturer's recommended pressure.
HideMKE
Champion Author Milwaukee

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Message Posted: Jan 17, 2015 11:15:30 AM

yes
Floridaman2013
Champion Author Florida

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Message Posted: Jan 17, 2015 6:16:31 AM

I always keep my tires at the sidewall max less 3-5 PSI for heat build up. Tires last long, car/truck handles great, and fuel mileage is at the max. Don't care if the ride is a little stiffer as we didn't buy these vehicles for a mushy ride.
twt
Champion Author Virginia Beach

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Message Posted: Jan 17, 2015 5:41:39 AM

I fill my tires, at the manufacturer's recommended pressure.
carinthuist
Champion Author San Francisco

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Message Posted: Jan 16, 2015 10:38:16 PM

yes
k7lvo
Veteran Author Medford

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Message Posted: Jan 16, 2015 10:34:45 AM

Up to a point. Over-inflation will improve gas mileage some, but tire mileage will suffer. Traction will suffer, too, leading to large expense.
pilotdlh
Champion Author Minnesota

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Message Posted: Jan 15, 2015 11:59:58 AM

Yes.
That's why tire pressure monitors are mandated on cars now.
46chief
Champion Author Indiana

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Message Posted: Jan 14, 2015 3:54:17 PM

A little, maybe.
dontuknowOH
Champion Author Ohio

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Message Posted: Jan 13, 2015 10:46:32 AM

Anyone that has ever roller skated or owned their own skates would probably know that wheels, when they are more round and also firm in construction, those wheels roll better.

The other part is the type of bearings, wheel material used, and then the floor(skating surface)V/S energy used/total weight involved. The worst problem is the small size of those skate wheel diameters in relation to bulk above or rather what total weight is on top of them rolling in motion.

There will always be some drivers out rolling around with no thoughts about vehicle tire pressure as a mind set. Bicycle riders soon stay clued in on the importance of correct tire pressure. Drivers that are counting their Fuel Pennies learn or don't care to. I routinely check my vehicles and leave those skates alone at my age, enjoy the memories/pennies saved.
badbobKY
Champion Author Lexington

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Message Posted: Jan 13, 2015 10:21:28 AM

no
carinthuist
Champion Author San Francisco

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Message Posted: Jan 13, 2015 9:47:55 AM

yes
WEDDY
Champion Author Phoenix

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Message Posted: Jan 13, 2015 9:01:50 AM

Yes
xtremecheap
Champion Author Arkansas

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Message Posted: Jan 11, 2015 7:05:35 PM

Yes try pushing your auto and then let some air out of the tires and try again.
Over inflation and under inflation both causes premature tire wear. Over wears the center, and under wears the sides. I like to era on the side of over inflation(1-5 psi) to what the vehicle's recommended psi.
If a lot of extra weight is being carried, I would go even a little higher.
GBMAX
Champion Author Phoenix

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Message Posted: Jan 11, 2015 5:23:04 PM

close
hoopitup2000
Champion Author Virginia

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Message Posted: Jan 11, 2015 3:59:12 PM

Yes. . . .
97PearlCat
Champion Author Tulsa

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Message Posted: Jan 11, 2015 3:39:29 PM

Yes it helps.
lilmx5guy
Veteran Author Scranton

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Message Posted: Jan 11, 2015 3:24:47 PM

Yes, but could decrease the tires life due to center wearing out prematurely, negating the gain in MPG.
Nuzan
Champion Author Nevada

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Message Posted: Nov 23, 2014 3:19:40 PM

Yes
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