Don't read into those numbers too much, i went to 4 different Pepboys locations for alignment in 1 week just to satisfy my curiosity:
- Initial read at PB#1.
- front numbers in red but drives straight like a champ.
- rear all green, 0.1* thrust angle to the left
- next day brought back to get alignment done - all numbers in green but started to pull to the right.
- Took it to PB#2 to get a read,
- told me that alignment is completely off
- next day PB#2 did the alignment, but interestingly their front left and right numbers were inverted compare to PB#1.
- still pulling right.
- Took it to PB#3 to get a reading,
- my shit is all red, "yah dude, it is off, we can get you taken care of right now"
- next day PB#3 matches front numbers with PB#1, but rear axle thrust is now in red, off by 0.28* to the right
- rear numbers are inverted from PB#1
- After 5 minutes of convincing them that my rear can be adjusted, they say that master alignment has to come in to do it.
- no longer pulling right.
- Took it to PB#4 to get it aligned, told them about the rear
- front numbers are kaput, bleeding red
- rear axle thrust is now reading "straight" at 0.08* to the left.
- They set front to what ever, rear untouched
I decided to end it at PB#4, told them about my experience and giggled at their confused faces. They took me to their machine, showed me everything, i told them that i get it but i am not making this up and showed them alignment print outs from previous shops.