Miata Mailing List: August 1999, Message #436

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i've been playing around with the inflation pressure on 
my tires for a while now after i having problems with 
drifting on the highway. i'm not too sure what to think 
of this. it seems after about a week and a half or so of 
driving, there is a notable offset in the inflation 
pressure on different tires. for example, after 
correcting the pressure to around 30 psi front and rear 
about two weeks ago, i noticed today that the right 
front and rear tires were offset by 2 psi with respect 
to the other two left tires, somewhere around 28 psi 
while the left front and rear were still around 30. Is 
there any explanation for this, i.e. driving habits, 
alignment, etc. it's geting a little annoying because 
the car always seems to drift at highway speed when 
there is around a 1 1/2+ psi difference in inflation 
pressue at one of the tires. Also, is this normal to 
experience drift with a difference of 1 - 1 1/2 psi?? or 
am i grabbing here and all of this is in my head. either 
way, correcting the pressure always seems to eliminate 
drift... so i'm not too sure if this is an alignment 
thing or not.  Would appreciate any help or suggestions. 

Steve
M2 Emerald,TP
Evanston,IL/Fairfax,VA