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Old 06-27-2011, 08:31 PM   #1 (permalink)
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Default New tires--Lower gas mileage

Our 2005 just hit 44k miles and we replaced the original Bridgestones with the Michelin Energy Saver. Stayed with the stock size. Handling, noise, ride all vastly improved. Mileage off from an average commute mpg of 62 to 56-57.

That's a big drop. Also it seems more difficult to charge the battery pack now. Has anyone else has this experience? If so, what fix is available (higher tire pressure?) if any?
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Old 06-28-2011, 04:29 AM   #2 (permalink)
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Higher tire pressure will help some, but the only way to get all of that MPG back is to go back to the Bridgestones.

There have been multiple tests showing a ~10% loss of MPG by those who switched to the Michelins. It is just a matter of which is more important to you (ride vs MPG)
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Old 06-28-2011, 12:18 PM   #3 (permalink)
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Default New Tires...

Thanks for the info. http://www.insightcentral.net/forums...lies/smile.gif

What would a good pressure be for that tire for someone who isn't trying to hypermile but just using the car in a normal fashion? Also, is it possible that the increased drag of this tire makes it harder to recharge the battery because they aren't as free rolling?

Thanks again,

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Old 06-28-2011, 12:41 PM   #4 (permalink)
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The price you pay for going with a tire other than the RE92's.

I suggest inflating to max sidewall to get the best increase you can with the tires you have.

Rolling resistance can have a fairly profound impact on the way assist and regen behaves overall. Assist will go higher for longer as you accelerate, and you don't get as much total regen due to slowing down faster.

Kinda a double edged sword in that sense. I will never run anything other than the RE92's until forced to.
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Old 06-28-2011, 01:40 PM   #5 (permalink)
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Quote:
Originally Posted by Eli View Post
The price you pay for going with a tire other than the RE92's.

I suggest inflating to max sidewall to get the best increase you can with the tires you have.

Rolling resistance can have a fairly profound impact on the way assist and regen behaves overall. Assist will go higher for longer as you accelerate, and you don't get as much total regen due to slowing down faster.

Kinda a double edged sword in that sense. I will never run anything other than the RE92's until forced to.
Eli, thanks for your input. As sticky as the Michelins are (I added 5mph to my favorite banked turn on the drive home each day!) I thought they might be adding to the overall rolling resistance.

I found that out when coasting down the Waldo Grade in Marin after crossing the Golden Gate Bridge. On the Bridgestones I needed to brake to prevent going over the speed limit. With the new tires the car got to about 64mph and just stayed there.

I'll try raising the pressure as you and Varak suggested as I know the Costco guys probably have them at 34-36, knowing them. I do love how quiet they are, though and I have read that as they wear in the mileage might improve, so between the two perhaps I won't suffer quite so much!

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Old 06-28-2011, 02:15 PM   #6 (permalink)
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As the RE92' are non available here in Europe, as are the B391' my Insight
came with, i have also recently put on a set of Energy Savers, and i have
not been able to measure any difference in gas mileage.

Not sure if the EU model Energy Saver is the same as in the US, but mine
has a max sidewall of 51 Psi, and i run them at that, - my old worn
out B391' were run at 50 Psi.
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Old 06-28-2011, 02:24 PM   #7 (permalink)
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Default New tires...

Quote:
Originally Posted by faxe View Post
As the RE92' are non available here in Europe, as are the B391' my Insight
came with, i have also recently put on a set of Energy Savers, and i have
not been able to measure any difference in gas mileage.

Not sure if the EU model Energy Saver is the same as in the US, but mine
has a max sidewall of 51 Psi, and i run them at that, - my old worn
out B391' were run at 50 Psi.
Wow, Denmark--and the only one, you say? Congrats! The only answer I can logic through to is that in the States we can only get the Summer version (at least through Costco...) where in Europe you also have the all season tire which might have a slightly firmer compound for the tread. Also, my region is a bit hilly--not sure how many mountains you all have in Denmark.

Best, Hondo
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Old 06-28-2011, 02:33 PM   #8 (permalink)
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Mine are the summer versions of the E.S.

You are right, we have absolutely no mountains here...
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Old 06-28-2011, 03:59 PM   #9 (permalink)
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I am considering checking a set of 4 RE92's as airline baggage when I travel from the U.S. to Sweden next spring, but I don't want to pay extra for oversize baggage or for too many checked bags. I figure that I could check two together as a single piece of luggage that would not be oversize. How does a company like TireMart package them? Would 4 tires be shipped as 4 packages, 2 packages, or 1 package of 4? It would be great if they are packaged in pairs so I wouldn't have to repackage them.

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Old 06-28-2011, 04:11 PM   #10 (permalink)
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I don't have much experience shipping tires, but from what I've seen - they just stick a UPS label onto the tire and off it goes. There's no real need to put them into boxes or anything.

As far as the airport goes.. I bet you could get all four tires into one big box? Might take two though, but I don't think that would be oversize or overweight, just whatever additional fees there are for two checked packages.
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