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04-20-2016, 10:11 PM
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#1
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Mar 2013
Posts: 463
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Hard tires and gas savings
So Mitsubishi got caught over-inflating tires to produce better mileage specs.
Should we run our tires hard then to help with our gas mileage too?
Say 5% - 100 lb vs 95 as recommended.
narrow profile and harder tires = better mileage?
__________________
2008 Fleetwood Southwind
W22 Workhorse Chassis 8.1L Chev Vortec
Allison 1000 transmission
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04-20-2016, 10:23 PM
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#2
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Senior Member
Join Date: Sep 2014
Location: Poulsbo, WA
Posts: 749
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Why sacrifice ride quality for a "possible" minimal mileage increase?
__________________
Bill and Debb---2010 CT Coachworks Siena 35V
1999 Jeep Cherokee Sport---Roadmaster Falcon 5250 -
1 Cavalon (Scooby) 1 Papipoo (Bella- DOB 5/06/18)
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04-21-2016, 08:23 AM
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#3
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Senior Member
Join Date: Dec 2014
Posts: 333
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I say go for it.
Higher pressure = less rolling resistance = cooler tires = longer lasting tires.
If you don't like it, a little psssst at each tire and you are back to the beginning at no cost.
I keep thinking that people (I belong to that class as well) confuse ride harshness with noise. It would be better to fix the loose micro wave, the loose screen window or the loose TV (all of which were once a problem in my Winnebago).
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04-21-2016, 09:04 AM
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#4
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Senior Member
Thor Owners Club Ford Super Duty Owner
Join Date: Jul 2011
Posts: 3,788
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Each coach make and model and tire make and model is going to behave differently. I played around with pressures always staying above minimum. At 15 psi over recommended for maximum axle loading the coach become very difficult to maintain in a travel lane.
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04-21-2016, 01:21 PM
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#5
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Mar 2013
Posts: 463
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Im still running 100 PSI all round on my new Toyos. Have to steer like a madman to track straight and listen to the tire whine - but think of my savings!
__________________
2008 Fleetwood Southwind
W22 Workhorse Chassis 8.1L Chev Vortec
Allison 1000 transmission
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04-21-2016, 09:03 PM
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#6
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Senior Member
Join Date: Aug 2015
Location: Oregon
Posts: 642
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Over inflation can reduce the contact patch of your tires. Not a good idea in a motorhome.
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04-21-2016, 09:14 PM
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#7
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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When our '02 DSDP was delivered to the dealer the transport drive had aired the tires up to 120 psi. The dealer didn't check them, but I did. since I didn't know the front axle weight I left them alone and went down to 100 on the drive. Turns out the front did need 120 psi, in fact, with those tires it needed 125 but the wheels would only take 120.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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04-21-2016, 09:57 PM
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#8
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Senior Member
Join Date: May 2011
Posts: 459
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I'm going to prove it, but, I can assure you, the higher the pressures, the easier the tires will roll. So do what you want, I'm leaving mine at 120 psi. As far as wandering, I think the Safe Steer, made a big difference, and a longer wheelbase is required too.
__________________
'05 Monaco Beaver 400 Quad SLD 400hp C-9 Caterpillar
2014 Grand Cherokee, Limited, diesel
Katie-Doberman Pinscher, Tigger, yellow Tabbycat.
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04-22-2016, 05:53 AM
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#9
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Member
Join Date: Mar 2015
Posts: 33
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FWIW - hypermilers in Prius(es) have been overinflating tires for years to get that 2 (~4%) mpg increase (at a slight decrease in ride comfort). In a motorhome, that's probably less than .4 mpg... Not sure you'd ever be able to notice it.
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04-22-2016, 07:33 AM
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#10
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Senior Member
Join Date: Aug 2012
Location: fulltiming
Posts: 295
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Tire manufacturers post tire inflation charts for a reason. Based on your weight there is a proper inflation for optimum handling and ride comfort. A lot of people think that keeping tires at maximum pressure is OK when it is not. You are running a higher risk of a blow out at maximum inflation pressure and you are certainly not having the best ride comfort and may be having handling problems and you are riding on OVER INFLATED TIRES. It is so important to have your MH weighed and inflating your tires for that weight.
__________________
Bob & Joan Alexander, 2010 Tiffin Phaeton 36 QSH, 2013 Jeep Wrangler (toad)
Lobo & Juniper (woof, woof)
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04-22-2016, 07:43 AM
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#11
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Senior Member
Join Date: Jul 2009
Posts: 623
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Over inflate and save a dime on fuel spend 10 times that putting your coach back together not to mention the cost of rattling your teeth out.
__________________
John, Pat and the cat named Missy
2011 Winnebago VIA T
HONDA 2015 PILOT in tow
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04-22-2016, 07:58 AM
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#12
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Registered User
Join Date: Mar 2010
Posts: 8,777
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Quote:
Originally Posted by ramblinboy
So Mitsubishi got caught over-inflating tires to produce better mileage specs.
Should we run our tires hard then to help with our gas mileage too?
Say 5% - 100 lb vs 95 as recommended.
narrow profile and harder tires = better mileage?
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ramblinboy
Harder tires, (aka: over inflated tires), also = a rougher ride.. handling problems and faster tire wear!
Mel
'96 Safari
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04-22-2016, 08:07 AM
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#13
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Registered User
Join Date: Mar 2010
Posts: 8,777
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Quote:
Originally Posted by GreaTOne65
I'm going to prove it, but, I can assure you, the higher the pressures, the easier the tires will roll. So do what you want, I'm leaving mine at 120 psi. As far as wandering, I think the Safe Steer, made a big difference, and a longer wheelbase is required too.
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GreaTOne65
It's a lot easier to use the recommended tire pressure than it is to increase the wheel base.
Mel
'96 Safari
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04-22-2016, 08:30 AM
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#14
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Community Moderator
Newmar Owners Club
Join Date: Feb 2011
Location: Point Pleasant Beach, NJ
Posts: 31,248
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If you really want to save money on fuel, slow down. That is a proven thing. Over inflating tires is a bad idea.
Over-inflated tires are a bad idea - WHEELS.ca
__________________
Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
No amount of money can buy you an extra second of time.
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