As a person that had a C5 for close to 8 years, a 05 for 2 and my present Z06 since 07 let me say one word "Techron". I found out about it when I had fuel tank problems in my 98 and as we do not have gas up here that has Techron in it I add some every few tankfulls. It does a good job of keeping the crud down.
Its available at Wally World, Pep boys and most likely any place that handles car parts/accessories.
Many of the boat guys up here on my lake swear by it also. Yes it goes in my boat also.
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