The Weber instruction book
When I had my first one - loooooong ago I decided to exploit its capabilities to the full. Christmas Turkey? - nae bother. On three charcoal briquettes as well! what more could a Scotsman ask for? Only later did I discover in the v. small print at the bottom of the back page "All cooking times are based on an ambient temperature of 70F and nil wind conditions" At Kinloss?? In December?? Amazingly it worked and took only slightly longer than advertised. It lasted for 31 years too. Took it to the dump only when we moved earlier this year.
The Ancient Mariner