Re: [ATM] OT: increasing mpg

["Bruce MacDonald" <brumac@gmail.com>]

There are ranges of acceptable substitutes (at least in Canada).  Any
competent tire dealer can go over the various acceptable tire size
combinations and discuss the pros and cons of each.  Outside that
range there could be consequence ranging from warranty issues to
increased liability assessed in the event that the modification
contributes to an accident.

Of more concern to me is the mention in the original post of running
with tires over-inflated.  If nothing else, the excess tire wear would
go a long way toward negating any fuel savings.  I have found over the
years that tire pressure has a huge impact on handling, and I can tell
by how my car corners which tire is under- or over-inflated.  I'm
often surprised by how little it is out of spec.

I first noticed this when I got my previous vehicle but it is the same
with my current one.  I wonder why I never noticed it before that.

--BM

On 5/5/06, jpritchett@antlers.k12.ok.us <jpritchett@antlers.k12.ok.us> wrote:
> In the united states we can change tire size without it invalidating
> our insurance. after all auto manufacturers do not choose a tire simply
> upon engineering principles they are also chosen based upon looks.
> since a narrower tire has less appeal than a wide tire "to the mass
> public" they go with the wider tire. he simply used a narrower tire to
> reduce rolling resistance and as a result got better mpg and spent less
> money going to his fav dark sky location to observe. I think the idea
> is worth looking into since "I think" he got around 7 mpg better for
> the trip.
>
> James Pritchett
> Antlers, HS
>
> ----- Original Message -----
> From: Richard <cnc@cncservo.co.uk>
> Date: Friday, May 5, 2006 10:07 am
> Subject: Re: [ATM] OT: increasing mpg
> > Hi Don,
> >
> > Friday, May 5, 2006, 3:29:14 PM, you wrote:
> >
> > DC> choose Goodyear Viva II and actually went with a narrower tire
> > than stock,
> > DC> 195 from the stock 205.
> >
> > If you did that here not only would your insurance be invalid
> > but you would get nicked by the first copper to stop you. In the
> > US, run by Laywers and insurance companies, I am amazed that you
> > don't have the same situation. The last time I saw a US car
> > handbook you could barely read it for red warnings notices.
> >
> > Seriously Don - you are compromising the handling of your
> > vehicle in a bad way and you probably won't notice it until that
> > one situation when you need that last bit of grip on a wet
> > corner... (in the picth dark of course, just to keep it on topic
> > :)
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