<VV> Tire Sizes and MPG

[UltraMonzaWest at aol.com]

In a message dated 9/18/2005 5:56:40 PM Pacific Daylight Time, 
rchivers at tampabay.rr.com writes:

> I am running 185 60 14 tires on my vair.  I get around 17 mpg around town. 
> My vair is a 65 convertable with a 95 hp with Pg.  My friend has a 65 coupe 
> 110 with 4 speed and gets 22mph around time.  He is running 185 80 14 tires. 
> 
> I like the way my car looks with the lower profile, but with gas prices I 
> have to wonder how much the tire size might affect the fuel economy.  I know 
> 
> when I am running 70 mph indicated it is actually running about 64 mph true. 
> 
> This is consistent with the different circumference of the two tires.  I 
> recognise that the standard will get better milage but it seems like quite a 
> 
> bit of difference.
> 
> Any thoughts or past experience with tire diameter and mileage ??
> 
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1  Have you adjusted the odometer for the same error?   10%  less than 
actual?
so  when your odo says 250 miles traveled since last fillup....it's really 
only 225.....

2nd...your shorter tires will actually help with a PG...only 2 
gears.....better gearing foraround town....

I'd start with recurving your distributor's mechanical advance to up the 
mileage...



Matt Nall / Patiomatt / WCUH / Mr. DeckRug
69 Monza Cpe., 66 Monza vert, 65 Crown v8 Cpe.
Somewhere between Reno, NV and Coos Bay, Or.