The real costs of 80 vs 55 mph

[Phase]

Wonder what a better tire size for my Ioniq would be. I have the eco 185/65/15s. Wonder how a skinnier tire at like 155 or 165 would affect mpg.

[freebeard]

You'll run out of tires before brakes, downhill in the mountains.

How does the vehicle weight compare with a BMW i3?

[Phase]

Originally Posted by freebeard

You'll run out of tires before brakes, downhill in the mountains.

How does the vehicle weight compare with a BMW i3?

No idea. But the hybrid is 3000 pounds. The guy at Costco said that’s why my tire treads never last as long as the advertised miles for tires. Said the hybrids are too heavy

[freebeard]

https://en.wikipedia.org › wiki › BMW_i3
BMW i3 - Wikipedia
Unladen weight did not grow much with the larger battery; the unladen weight was 1,345 kg (2,965 lb) for the regular i3 and 1,365 kg (3,009 lb) for the i3s.

It looks like you could go to tall narrow 19" tires.

[Phase]

The more premium ioniqs come with 17 inch tires. The eco one I got has 15 inches. Obviously that means I should have a little wiggle room to fill in the wheel arch gaps

[aerohead]

Originally Posted by Phase

Wonder what a better tire size for my Ioniq would be. I have the eco 185/65/15s. Wonder how a skinnier tire at like 155 or 165 would affect mpg.

*GM used tires as narrow as 145mm with their Aero 2002/ 2003A concepts.
* The tire circumference to wheel arch gap needs to remain constant.
* The outside face position of the sidewall needs to remain constant.
* The load rating needs to be equal.
* Lateral G-Force loading / adhesion ( skid-pad ) capability needs to be equivalent.
* Speed rating needs to be equivalent.
* Dry traction rating ( compounding, tread design ).
* Wet traction rating ( compounding, tread design ).
* Temperature rating.
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Wheel fairings can reduce aerodynamic wheel drag by up to 70%.

[mpg_numbers_guy]

Originally Posted by Phase

Wonder what a better tire size for my Ioniq would be. I have the eco 185/65/15s. Wonder how a skinnier tire at like 155 or 165 would affect mpg.

It's going to be hard to find an eco tire that's skinnier than 185 without sacrificing diameter. A 185-width low rolling resistance tire will be more efficient than a 155-width tire with high rolling resistance.

[freebeard]

You must not have put Permalink #33 and #34 together.

ecomodder.com/forum/showthread.php/bridgestone-announces-large-diameter-narrow-tires

[Ecky]

Anecdotally:

-In my stock Insight, fuel economy effectively stopped improving below 50mph - ~100mpg was my effective cap regardless of whether I was driving at 30 or 50. It *appeared* that as speeds dropped I was more affected by things like climbing hills or needing to brake for turns, proportionately. Presumably, parasitic losses also became a larger portion of total energy used, relative to distance traveled.

-In New Zealand, the national speed limit is 100kph, and there is virtually no culture of speeding. In fact, people often drive 10-20 under the limit, and there is a reasonably strong push to drop the national limit down to 90 or 80.

[Phase]

Originally Posted by mpg_numbers_guy

It's going to be hard to find an eco tire that's skinnier than 185 without sacrificing diameter. A 185-width low rolling resistance tire will be more efficient than a 155-width tire with high rolling resistance.

I use over inflated ecopias in the summer. Right now I got my sticky gummy bear winter blizzak tires on right now. Probably can’t get anymore high rolling resistance unless I had studs or added chains lol