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05-05-2021, 05:31 PM | #1 |
Drives: 2007 3 door Join Date: Feb 2021
Location: Halifax Canada
Posts: 5
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BETTER fuel economy at recommended tire pressures
I got an '07 3-door manual a few months ago, my first car of my own. The clearcoat's fucked but I don't love her any less because of it.
Since then I've been running between 36-38 psi because that'll get me better fuel economy right? At between 6.5-6.9L/100km between fillups (I normally fill about 400km into a tank), I was pretty happy. Wrong. 2 fillups ago I lowered my 2 month old 175/65/14 Hankook Kinergy ST's to the doorjam-recommended 32psi, curious about how much more fuel I'd use. To my shock, over the first 400km I got 6.0L/100km on the dot. I was skeptical, thinking the pump I'd used for that fillup cut off earlier than other ones. But today I went back to the same pump after 350km of driving and recorded 6.1L/100km. No changes in driving style, weight of the car, other maintenance, nothing. Only the tire pressure changed. Might go lower them to 28 and see if I get 5.5 |
05-06-2021, 07:01 AM | #2 | |
Drives: Yaris 2016 1.3 Manual Join Date: Jun 2017
Location: SAUDI ARABIA
Posts: 131
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Quote:
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05-06-2021, 04:43 PM | #3 |
Drives: '22 Mazda CX-30 CE AWD 6-AT Join Date: Feb 2019
Location: American Dystopia
Posts: 158
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I averaged 41-42 MPG over the 4 year ownership of my 2015 Yaris SE 5-MT hatch, & always had my tires at 34-35 PSI. Here in AZ, USA it doesn't get cold enough for it to affect MPG really, so it remains consistent year round.
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2015 Toyota Yaris SE Hatchback, Super-White, 5-Speed Manual (August 2015 to August 2019) 2020 Toyota Corolla SE Sedan, Super-White, 6-Speed Manual (August 2019 to February 2022) 2022 Mazda CX-30 AWD Carbon Edition (CE), 6 Speed Automatic (February 2022 to ???) |
05-06-2021, 06:10 PM | #4 |
Drives: 2014 Yaris SE Join Date: Apr 2014
Location: NYC
Posts: 1,076
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Too many variables in play. Summer gas perhaps? There is a direct relationship between MPGs and tire pressure. You are describing an inverse relationship. I don't see how this is possible. I don't doubt your numbers but there must be another explanation.
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05-07-2021, 08:02 AM | #5 |
Drives: 2007 3 door Join Date: Feb 2021
Location: Halifax Canada
Posts: 5
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Can't say I kept track, of the weather, though temperature here in Nova Scotia fluctuates wildly on a day-to-day basis. I got about 7-7.5L/100km in winter conditions with winter tires for the first 3 or 4 weeks of ownership, then it was all season time. Since then, it's been anywhere between 0-15 degrees C on any given day.
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05-14-2021, 11:39 AM | #6 |
Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019
Location: ‘Murica!
Posts: 453
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I have a manual transmission and are on 185/60R15 tire/wheel combo, every two weeks that I fill up I check and maintain 33psi in my tires. I do a lot of city driving, and I have a leaded foot, so I'm lucky to see 32mpg (7.35/100km). I only saw 40+mpg (5.88-/100km) when I drove from Maryland to California, thanks to the cruise control that I installed. I only got pulled over once when I was in Texas for going 80 on a 75?!! Oh and I was on the far left lane when I was the only one on the road.
Instead of messing around with the tire pressure, why not just buy bigger tires next times when it's time to replace them? 185/65R14 or get new wheel and tire combo 185/60R15. |
01-12-2024, 11:47 AM | #7 |
I've made a post!
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Your experience with tire pressure and fuel efficiency is intriguing. Have you considered checking the alignment of your wheels or exploring other factors that might influence fuel consumption, apart from tire pressure? Additionally, what made you choose to lower the tire pressure initially, and have you noticed any changes in your driving experience with the adjustments you've made?
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01-25-2024, 05:58 AM | #8 |
I've made a post!
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What made you choose to lower the tire pressure initially, and have you considered checking the alignment of your wheels or exploring other factors that might influence fuel consumption, apart from tire pressure?
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Tags |
fuel economy, hypermiling, tire pressure |
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