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A tire company I have used for many years here in WA state is Les Schwab. They hand tighten lug nuts and torque them with a torque wrench. I have yet to find a great disparity in torque when I go back a week or ten days later.
What I did find this last time when I had them change tires between a set of wheels was that the tire pressures were all over the map. They varied by 12 lbs between tires. This was the next day after they were changed and I had started with the set I was storing. Well, I called the store. They refunded $50 of the fee!
Good bunch of guys!!
As far as the electric wrench? Kinda like tits on a boar hog, just my opinion. I had one given to me a year or so ago. It was not able to break loose the lug nuts. This was on a light weight car (Subaru) and I doubt the nuts were more than 90 ft lbs. After carrying it around for months and it not doing the job I felt kinda stupid.
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