It has entirely to do with the capless fueling system.
Check under your carpeted trunk piece that covers your spare....
There should be a white colored plastic nozzle attachment that inserts into the gas tank nozzle, it is essentially a funnel, but adapted to work on your SHO.
You then can pour w/e it is your little heart desires into the that funnel, & it'll go directly into your tank, rather then onto the ground.
Good luck!

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