I tuck mine into the passengers handle. Since it's just above the opening I can't miss it. Did OK for the two years I've owned it.
Mark K
1986 GL/2WD/4SPD
1990 Carat/2WD/Auto

On Feb 22, 2011, at 9:11 PM, Mike S wrote:

> My cap tucks nicely in the sliding door handle - so that's where I put
> it when filling. It's pretty obvious, being so close to the fuel
> filler, and it would take a pretty good bump to knock it out...