#1: I can't seem to find it in the owners manual, but does anyone know if it is okay to shift from regular drive mode into the sport shift mode while moving?

#2: Can a full size spare fit into the trunk space where the the air pump is?

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I can help you with question number 1. Yes you can switch from Norm to Sport or vise-versa while moving the computer will sync itself (you'll see a message on the message screen).

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Yes.

Yes.

If you put the full size spare in upside down, you'll have room for the jack and the lug wrench you're gonna have to buy.

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G8 GT 615

Great! Thank you both for the information!

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Or you can put the lug wrench and jack underneath the spare tire and put it in rightside up. If you put it in that way you can use the hold down that "screws" onto the post to hold the tire inflator to hold the full size spare tire down too.