Not to pick nits unnecessarily here, but will application of the blanket STCs for G100UL and UL94 also pertain to engines that have been modified under various other STCs. A popular example is the 150 HP Lyc. 0-320-E3D (found in later Piper Cherokee 140’s and early Warriors) that were modified to 160 HP under a RAM STC. That STC requires that the modified engines use “100 or 100LL Avgas Only.” For this example G100UL might not pose any “STC conflict,” but UL94 might. If the blanket fuel STCs are something less than “blanket,” it would be prudent for operators of all sorts of STC-modified engines to review the fuel requirements specified in their STCs and resolve any conflicts.