My gas gauge acted funny some time ago, (2 years?), anyway, it went away after I filled it up.
Two days ago I filled it again, and it didn't quite act right...it showed about 7/8 full, and then over the next 12 miles slowly worked toward full. It is working OK now. I know that this is a common problem in the C5s, but I'm wondering if anyone has had any luck fixing it. I have been told that the brand of gas makes a difference, but that doesn't seem to matter to me as I'm not loyal to a brand. Here in AZ (recently moved here) they only have 91 octane anyway. 
Mac