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Message: <blockquote data-quote="Schwepps" data-source="post: 348292" data-attributes="member: 3592">Agree that it's a bit of a trade-off astro. But evaporation is more than just a loud hiss, you do lose some power too, as it's the most volatile components that evaporate. And it doesn't just stay in the tank to hiss out when you open the cap, there is also a pressure compensating valve to escape through. It's a question of which you prefer I suppose. I prefer a tank between 1/2 and 1, which is also factored in the 50:50 weight distribution design by BMW. :wink:Here's another piece which has made the rounds in the web. Interesting, and all makes sense. <a href="http://shaktibanna.blogspot.com/2008/06/savepetroltips.html" target="_blank">http://shaktibanna.blogspot.com/2008/06/savepetroltips.html</a></blockquote>