http://www.tirebusiness.com/article/20141204/NEWS/141209953/for-mpg-gains-tire-makers-deliver-consumers-shrug" onclick="window.open(this.href);return false;
...Five years ago, the National Highway Traffic Safety Administration proposed introducing a national standard to gauge low-rolling resistance, to be used as a consistent consumer guide, similar to EPA fuel economy ratings. The implementation of that standard is still pending.
California regulators also have proposed creating a low-rolling-resistance guide, but that plan has stalled...
...The tires introduced on Kia Motors America's new electric Soul — Nexen CP 671 Classe Premiere — are being marketed as “super-low-rolling-resistance” tires.
Steve Kosowski, manager for long-range strategy at Kia, said the tires are a step beyond what other auto makers have been introducing in the past couple of years.
Manufactured by Nexen Tire Corp., the new "supers" reduce enough friction to contribute 3 to 5 miles of extra driving range for the battery-powered car. The Soul boasts a battery range of 93 miles, positioning it above the EV-segment leader Nissan Leaf, which claims an 84-mile range...
Slow1 said:Good article, I had not considered the interplay of the CAFE rules, manufactuers and the replacement tire decisions.
Anyone seen any studies/information in efforts to build LRR roads? I wonder if this is taken into account when highways are resurfaced....
I put Ecopia's on my Prius, went from getting 55 mpg to 65 mpg at 60 mph. They replaced Kumo super high performance tires. 5 mpg is 10% on this car and that is what I expected, I got double that. I am very happy with the LRR tires. If they last 40k miles they will be free.2k1Toaster said:I find it entertaining that the average person expected 5mpg to 10mpg improvement from getting a LRR tire. Shows that people really are just ignorant of science. Considering on average they are getting low 20's mpg, to say they want 25% to 50% improvement is ridiculous.
donald said:What contribution did 'observer bias' play, I wonder.
There are few measures more likely to be biased than fuel consumption figures.
pchilds said:donald said:What contribution did 'observer bias' play, I wonder.
There are few measures more likely to be biased than fuel consumption figures.
I don't think there was any observer bias. How can miles driven divided gallons used be biased?
I easily lost 10% going from old Ecopias to new RoadHugger GT Ecos (Kumho Ecowing KH30). Others have seen worse with other tires. And these are supposedly LRR tires. I ran the data and efficiency went from ~210 Wh/mi to ~250 Wh/mi initially, are slowly improving to about ~235 Wh/mi after 2k miles so far, so still 10% worse, though admittedly it's a bit cooler now.2k1Toaster said:You are not going to get a 10% improvement from LRR tires.
drees said:I easily lost 10% going from old Ecopias to new RoadHugger GT Ecos (Kumho Ecowing KH30). Others have seen worse with other tires. And these are supposedly LRR tires. I ran the data and efficiency went from ~210 Wh/mi to ~250 Wh/mi initially, are slowly improving to about ~235 Wh/mi after 2k miles so far, so still 10% worse, though admittedly it's a bit cooler now.2k1Toaster said:You are not going to get a 10% improvement from LRR tires.
Look, I'm not the only one who's noticed a significant difference with non-Ecopia tires. Pretty much everyone who stuck with Ecopia tires could not tell a difference between old and new tires. Check this thread: http://www.mynissanleaf.com/viewtopic.php?f=31&t=16282" onclick="window.open(this.href);return false; TickTock lost about 15% going to MXV4 tires.2k1Toaster said:Cooler and new tires. You can't compare them that way because what you are measuring, or "running the data on", is an incomplete set.
drees said:2k1Toaster said:Regardless, my point was the claim that "you're not going to get a 10% better efficiency from LRR tires" is simply not true. It's quite easy to get 10% better efficiency from tires, depending on how bad the non-LRR tires are. Stick on some sporty summer tires and I bet you don't even get close.
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