Slightly off topic but similar in a way. Previous life on oil tankers and always wondered why not much was made of loading fuel without taking account of temperature for payment. Individually it probably doesn't make much odds but over a fleet per year must mount up. Oil business very careful about it as when loading 30 000t of gasoil in Venezuela at 30 deg.C and delivering to Boston in winter makes a huge change in volume. Ship calibrated in cubic metres and so dealt with metric tonnes with density at 15 deg. C but of course USA in barrels at 60F (not the same) with an API figure. Remarkably the figures worked out pretty closely.