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Old 04-20-2016, 11:11 PM   #1
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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?
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Old 04-20-2016, 11:23 PM   #2
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Why sacrifice ride quality for a "possible" minimal mileage increase?
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Old 04-21-2016, 09:23 AM   #3
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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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Old 04-21-2016, 10:04 AM   #4
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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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Old 04-21-2016, 02:21 PM   #5
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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!
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Old 04-21-2016, 10:03 PM   #6
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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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Old 04-21-2016, 10:14 PM   #7
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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.
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Old 04-21-2016, 10:57 PM   #8
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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.
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Old 04-22-2016, 06:53 AM   #9
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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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Old 04-22-2016, 08:33 AM   #10
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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.
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Old 04-22-2016, 08:43 AM   #11
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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.
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Old 04-22-2016, 08:58 AM   #12
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Quote:
Originally Posted by ramblinboy View Post
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?
ramblinboy
Harder tires, (aka: over inflated tires), also = a rougher ride..handling problems and faster tire wear!
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Old 04-22-2016, 09:07 AM   #13
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Quote:
Originally Posted by GreaTOne65 View Post
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.
GreaTOne65
It's a lot easier to use the recommended tire pressure than it is to increase the wheel base.
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Old 04-22-2016, 09:30 AM   #14
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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
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