Duke
I'm not sure your numbers are that accurate. I prefer to run the
numbers using the measured circumference of the tire. There is also the
question of how accurate is your speedometer and tachometer. Measure your
tire circumference and re-calculate. The stock Tiger tire I believe had a
diameter around 23.7" so unless your buying a tire close to that size I
don't think you will see much MPG improvement from just the tires.
I'm not sure where you can drive 78 mph all the time but here in NY
State you would be getting tickets all day long. This state is short on
money, just like many others, and one way to generate more cash is to catch
more speeders. The Police have reduced their max speed tolerance to match
the State's need for income. One speeding ticket would overshadow any MPG
savings not to mention putting a damper on the trip. Slowing down a bit
should increase your MPG.
Ron Fraser
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of wsamouce
Sent: Saturday, July 03, 2010 11:49 PM
To: tigers@autox.team.net
Subject: [Tigers] Gas milage with different tires?
Hey guys,
I am thinking about a bigger rear tire to save me some $$ when driving 1600
miles to TE/AE United 2010. The Sumitomo's I have (195/60R13) are 22.4 in
diameter and 935 revs per mile. If I go to the 205/60R13, they are 22.8 in
diameter and 914 revs per mile. I am trying to figure out if the gas
savings would offset the $170 cost of the tires with mounting.
I just can't get my head around the math to figure it out. I am currently
running 3600 RPM at 78 MPH (3.07 gear). I plan on running the same speed,
with cruise control, all the way to Maine. The larger tire would allow me
to run at 3535 RPM for the same speed.
TIA!
Duke
B382002037
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