I throw a can in the gas tank when its gets down about 1/2 way every now and then. Seems to clear things up a bit, idles better too.

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Streetside: 1987 Mercedes 300E Petrol Blue/Green
2014 Ford Mustang Grabber Blue
1999 Ford Ranger Green

Dockside: 1968 Eltro 17
1985 Silverton 34C