Do Underinflated Tires Kill Your Fuel Economy? Let's Find Out! | Ep. 1

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*DISCLAIMER: Regardless of the results, we obviously don't recommend deflating your tires when driving on pavement for your safety and that of other motorists. We conducted this test strictly to see how fuel economy would be affected if your tires were at a far lower than the manufacturer-recommended PSI rating.*

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Its not that it will cost you 9 dollars more to fill up, but that you will have to fill up 46.8 miles sooner.

davidblalock
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You guys should do over inflated tires also

Justaeuropeanman
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Haven't watched the video but simply having driven a bike with underinflated tires tells me all I need to know.

TheDiamond
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I love the series and reviews of basic trucks. Sure the Hummer is awesome to look at but there's zero chance of me ever buying one. This series will inform my next truck purchase

bigric
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Happy you guys are having so much success with the "Stubby" series. Here for it!

omardevonlittle
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Deflating the tire increases rolling resistance, so it takes more fuel to turn to overcome that, resulting in less mpg. Great content!

vr
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That was interesting. I thought it would have made a bigger difference than 10%. Under inflated tires are costing efficiency for sure, but also they’d wear out a lot faster too.

JamesMcLaren
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It would be interesting to have a temperature guage to see what the tire heat was after each run. It would be much warmer on the under inflated tires and that would lead to increased tread wear.

fscottgray
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How about a comparison between running at the maximum inflation pressure on the tire versus the recommended pressure on the vehicle?

kevinstenger
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I've been checking this for decades, and I've found that 36-psi cold -- in the morning without the sun hitting the tires -- is the best compromise for mileage vs comfort.

Davran
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Great test! Actually, before watching this I had actually checked my tires yesterday on all 4 of our vehicles- 2 Jeeps, a sequoia, and a crew cab Silverado, and all had gone down about 8lbs in the last 2 months because of the significant temperature drop we have seen in North Mississippi already. Nice to know the stats now 👍

michaelcrouch
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My car always drives better when the tires are inflated correctly. Sometimes I don't check my tires because I don't have an air compressor, it's too cold out, I'm lazy etc, but when I finally adjust them I can definitely tell the difference. I'll try to keep up on them now, thanks for posting the video guys I enjoyed it

buddyphillips
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I wish you added 1 more loop with overinflated tires, say 55-60psi. Thanks for the video!

Followthelemming
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Should have done over inflated as well

bernhardjordan
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A more important consideration when running on underinflated tires is safety. The tires will get hotter which can lead to things like tread separation or sidewall failure. This leaves the possibility of being stranded or having an accident. The best thing, check your tire pressure regularly. You will save money and be safer.

timwoody
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I think this test should be done on highway only, thet city driving changes the whole equation, the friction of the tires rotating also changes with speed but still good content, thank you guys for all you do.

rubendawn
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Try riding a bike with low tire pressure. Then fill tires to specs and ride again. HUGE difference in effort. I think using a huge brick PU truck to show mileage change is less dramatic than a econobox car w/a small displacement engine. The higher mpg's you get normally, the more drop you'll notice w/low tire pressure.

curtchase
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now that you have underinflation data, perhaps you can over inflate them 15 or so pounds & do a comparison to see if you milage increases by a similar percentage.

timkis
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I think the test you should do is : one(1) loop with +5psi from sticker, and one (1) loop with -5psi from sticker.
I own two(2) different Chrysler products with that 3.6, on both vehicules airing up to the prescribed psi door-jam sticker wears the tires in the middle and 'fast', within a year the tires are done. So I run them 2psi lower in order to wear the tires evenly from one sidewall to the other.

guillaumeauclair
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Makes sense that handling would be worse with underinflated rubber. I doubt that you would do the test with OVER-inflated tires, but if you had, I would have given this experiment more credence.

Thanks for the content.
Keep up the good work.
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