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It should hold up just fine over time. It's common and lighter to use an aluminum can (e.g. V8 or Red Bull). Lop off the bottom inch and a quarter or so, or the top if you don't open it first. The edge isn't especially angry and probably won't cut you even if you don't roll it unless you're unusually violent with it.
Your fuel efficiency numbers seem fine - make sure you have a good windscreen, which will also act as a heat reflector.
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