Leach transmitted he had 1600tons of fuel available at 12:53 (IIRC), so roughly 40% of burnable fuel remainig of initial stock (I think). He continued the mission up until mid-day on May 26th, when he started the return journey to Iceland to refuel. So IMHO, fuel was not a big problem on mid-day May 24th.
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Hopefully someone with actual service sea time can confirm/correct the following. It is my understanding that fuel state becomes a matter of concern when it reaches 50 percent; if so, then 40 percent might be described as a matter of high concern - especially if cruising in distant waters.
According to Wiki, PoW achieved a trial speed of 28 knots @ 111,600 shp with a fuel consumption of 0.73 lbs/shp/hour. Therefore, 1600 tons of fuel would have limited her to an absolute theoretical maximum of 44 hours of steaming time at 28 kts - about 1200 sea miles - disregarding potential effects of weather, sea state, and battle damage. Assuming a power/speed relationship = speed^3 at speeds > square root of waterline length, this would suggest an endurance of perhaps 1500 sea miles at the lesser speed of 26 knots.
I have a feeling that Leach would probably have felt uncomfortable with only 1600 tons of fuel remaining aboard.
Happy holidays, my friend.