Thanks for the link Metalman, I DL'ed it, but it doesn't really do us surface guys any good as it is based on max rpm loads, and not full rpm range. It states a peak 90% efficiency which is nice.
About your question, I can't tell. You may as well stop asking, no one will ever guess it.
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens