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Don't test new fuel on race day. Test it on Sunday — every Sunday between now and the start line. The Power Endurance System gives you the whole block in one box: a 1kg pouch of Energy Pastilles, 900g of Power Fluids, the black 710ml bottle and the Adventure Pouch. First box £49.99, then reloaded every six weeks. Swap flavours, pause or cancel anytime. 4.82 from 442 verified reviews. UK-based, UK-stocked, UK-shipped.