About a month or so ago when we featured bumper panel gap lines here on Design Details, several comments highlighted the odd gas filler cap on the newest Focus hatch. This design idiosyncrasy reminds us of the history of the fuel filler cap from the trunk fillers of yore to the iconic chrome racing cap. What are some great examples of these weird and interesting fuel filler doors?

Here is the Focus hatch’s neatly tucked gas flap...


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And here is one of the iconic Caddy taillamp fillers...

So what do you think Oppo?

What are the best/worst/most interesting fuel filler doors?