Thank you, Ed. And alongside that commonplace use extract we can also put this example of the more technically correct usage from
http://www.wwiiaircraftperformance.o...rade-fuel.html
"Testing continued, with an Air Ministry
Memorandum on Introduction into Service Use of 150 Grade Aviation Fuel of 25 January, 1944 summing up the position with respect to performance, production and requirements. The Memorandum concluded in part:
- On the basis of the figures used, it is apparent that the earliest a substantial quantity of fuel can be allocated, i.e. 40,000 or 60,000 tons for Home Based Fighters is May/June. This would still permit the allocation of one month’s consumption and one month’s reserves, i.e. 73,000 tons to A.E.A.F. Fighters in June."
There is also a link on this page to a full reproduction of the Jan-44 Air Min memo.