Your best bet would be to use the SGII for a couple tanks in a row in one vehicle and then record the % adjustment for that car before moving the SGII to another vehicle and repeating the process. After a few tanks in each car you will have your % adjustment for each vehicle and you can plug that in when you move the SGII from vehicle to vehicle.
There is a thread on ecomodder where guys have posted their % adjustment for their cars so maybe you can find your cars in that thread and use their % adjustment values if you don't know what they are already.
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