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Right here in Mississippi, regula gas is at many gas stations at dedicated pumps, of course its any were from 80 cents to a buck more per gallon but on boat motors its a must have. Also Harleys run better on it too.
Go to a auto center and get a product called, Back to Black, I used it on my Harley's fairing and it worked fabulous.
Easy 3D Printing
It's not an ammo case, it's a cartridge or shell casing.