LAC: Biodiesels, Diesels, TDIs' etc...

[Geraint Lloyd]

isn't it called "rolling resistance"

hence the whole michelin energy tyre range

is far as i know it's about the size of the contact
patch and the 
rigidity of the sidewall (flexing = energy loss)
i guess that the compound must play a small part in
this as well though

geraint


Ed Kellock wrote:
> Wouldn't the weight and the probably larger, wider
size of the performance
> rubber be the real cause of the mileage difference
and not the amount of
> grip the rubber has on the road?  Just doesn't seem
like the grip could
> account for really any change in mpg.  Don't most
poeple run smaller,
> narrower rubber in winter than in summer?  And in
many cases, different
> wheels too?
>
> Ed
>
>
>   
>> -----Original Message-----
>> From: quattro-bounces at audifans.com 
>> [mailto:quattro-bounces at audifans.com] On Behalf Of
LL - NY
>> Sent: Thursday, April 27, 2006 6:27 PM
>> To: Taka Mizutani
>> Cc: Quattro List; DeWitt Harrison
>> Subject: Re: LAC: Biodiesels, Diesels, TDIs' etc...
>>
>>
>> I experienced the same thing as Taka, switching
from Nokian 
>> RSi's to my Bridgestone RE011's on the Saabaru.
Lost 2 MPG 
>> going from a moderately low grip snow to a
relatively sticky 
>> summer. I've REALLY had to nurse the car to attempt
to 
>> reclaim some MPG, shifting at 1900 RPM, etc. Need
to get the 
>> UrS out for a roll.
>>
>> LL - NY
>>
>> On 4/26/06, Taka Mizutani <t44tqtro at gmail.com>
wrote:
>>     
>>> I think in the case of a Infiniti M45 Sport, that
those wide 19" 
>>> performance tires
>>> are not going to help fuel economy at all. I lost
about 2 
>>>       
>> mpg in my 200q
>>     
>>> when I
>>> went from 225/45 to 255/40 tires.
>>>
>>> I've lost about the same 2 mpg going from my
winter Hankook W303 in 
>>> 175/65R14 to Falken Azenis RT-615 in 205/50R15.
That's going from a 
>>> pretty low-grip tire to a
>>> really sticky tire. I imagine that in a heavier
car, the 
>>>       
>> difference would
>>     
>>> be
>>> much worse.
>>>
>>> Taka
>>>
>>> On 4/26/06, DeWitt Harrison <six-rs at comcast.net>
wrote:
>>>       
>>>> Well that's really good, IMHO. In my 2006
Infiniti M45 
>>>>         
>> Sport (4.5 L, 
>>     
>>>> 340 hp),  I'm lucky to get 15 mpg just loafing
around 
>>>>         
>> town. That's a 
>>     
>>>> big cost penalty for a bit of rubber burning when
you 
>>>>         
>> need(?) it. I 
>>     
>>>> think the V8q does a lot more with what it's got.
>>>>
>>>>         
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>
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