all good stuff....
..But please remember that TSFC does not get smaller and smaller indefinitely the higher you go. If a manufacturer shows you a graph suggesting that this is true, ask to see the plot of installed TSFC against thrust, ML/D, L/D, even God Forbid CL by itself. The curve starts with relatively high values, not unsurprisingly, and curvilinearly falls to a nadir where it stays for a bit then with a waywardness of all mechanical devices starts to climb again. And just to heighten the fun, if you pardon the unintended pun, the nested curves for various flight levels are skewed and minimum TSFC rarely coincides with maximum L/D or the flight level you'd really like.
Other than that I'll get my coat and sit in pedants corner.
The "E"