Saturday, September 13, 2014

Fall Is Coming, Time To Adjust Your Tires!

Being a Military Brat meant living in a lot of different areas of the country which meant experiencing just about every kind of weather, so I can say with certainty that Late Summer/Early Fall is the best time to be a resident of the Great Pacific Northwest. Unlike Spring when the area passes thru the same general temperature swing, this time of year is fairly dry which means less cloud cover so warmer days and colder nights.  Cloud cover acts as a blanket to keep the nights mild and the days cool but we have had a wondrous string of near perfect sunny days.  Typical highs in the upper 70's occasionally touching 80 but no warmer.  The nights are getting colder though with a prelude to the coming change in the seasons. 

This means we need to adjust our EVs!  We all know that proper tire pressures helps us get more range. How much more? Good question but I am betting you are not willing to find during your 80 mile family outing next weekend!  Your tires maximum pressure, generally 44 PSI does allow for pressures to go higher but even going a little lower can have ramifications on range and longevity.  The general rule of thumb is that every 10º change in temperature results in a 1 PSI change in pressure.  Your tires should be set at "cold tire pressure." So "what temperature is that?" you ask. Well, it depends. Its actually means the coldest your tire is likely to see.  So its the first thing in the morning reading. Now, here that has been in the mid 40's lately. For Phoenix, probably closer to the mid 70's. So you get the picture.  

 Now some background. My tires are running 1 to 1¼ lbs higher in the front generally speaking.  Now on the front one tire is good, one should be reduced about ¼ and on the back, one should have 1½ PSI added while the other gets about 1 PSI.  But yesterday, I got up and it was about 45º and saw this. 

Sure sign Fall is almost here!  Below is the picture taken while driving between morning job and afternoon job. It was 75º.  Definitely a difference!

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