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Based on the quote from the patent in Cap'n Jack's post above, G100UL appears to be a blend of components available in most complex refineries. The exceptions might be the toluidines and trimethylbenzene. Based on that quote, there doesn't appear to be a "secret sauce" and the wonder is that...

100LL and G100LL can't coexist side by side for long. For one thing, most FBOs can't and won't handle two avgas grades. Second, once G100LL is fully approved and field experience gained, expect the EPA to sunset 100LL out of existence. That's been the goal all along. At that point, if your...

When the G100 is approved for all aircraft engines, 100LL will be sunsetted out of existence. Most FBOs can only handle one grade of Avgas without further capital investment, so G100 will be the only fuel available, unless you have a mogas STC. Seems to me a more painless way for GAMI to...

Seems like we're stuck over the definition of "efficient". I'm not an aeronautical engineer, but I've been reading about airplanes and flying for 60 years and I've never heard of a wing or propeller being less efficient at higher altitudes. If they were, we'd fly as low as practical.

But it's not constant pitch, so at the same RPM pitch is higher in thinner air, at constant power. Of course, engine output is lower in thinner air (normally aspirated), but that's a different matter and we all agree on its effect on performance. As for the wing, it's not "less efficient"...

Sure about this? It seems to me a CS prop will just run at higher pitch to maintain RPMs at a given engine power output. So, it seems to me, talk about wings and propellers losing efficiency with altitude is not correct.

How often will you fly, and how flexible are you? Many sole ownerships turn out to be very expensive per hour and the aircraft isn't flown enough to stay healthy. I have been in 3 and 4-way partnerships for over 20 years and they've all worked well and the partners become friends and flying...

What Arob said. In addition, I would add that compression readings are notoriously non-repeatable, i.e., they have a lot of variability. And, 64/80 isn't that bad. However, nowadays any good pre-buy inspection should include a boroscope look inside the cylinders. That will tell you if you...

Take a chance?

CAS, CAP?

An autopilot can basically do one thing. A wife who can also fly?

If you're on Facebook, look for local affinity groups.

Top popping off would only be a problem in case of loss of pressurization. Are you feeling lucky?

Look realistically at the hours/year you will fly, and all costs. You may find renting is cheaper than sole ownership. Or look for a partner, maybe one who already has a hangar. Two birds, one stone.

More factors enter into it. When I was working, I had 3-4 weeks of vacation, and those days were valuable to me. I flew our Bonanza from Texas to South Caroline 1-2 times a year, less than 7 hours including a fuel stop. My alternatives were to drive, a hard two day trip with an overnight stay...

I've stopped even asking the wife what anything cost because I know the answer: "We have an airplane."

What the OP wanted was more than some instrument instruction. He wanted the required three hours in preparation for the check ride, and the instructor's signature that he was ready for the check ride. A thorough review of the logbook was certainly warranted, especially since some of the...

If you're in VLOC, you're flying the LOC/GS. I've noticed this too and assumed it indicated the availability of LPV for that runway.

Nice diner on the field. Lots of B&Bs in town. German vibe. If you're a history or WW II buff, the Museum of the Pacific is world class. Plan on at least half a day. (Fredericksburg was the birthplace Admiral Chester Nimitz.)

Don't know about you guys, but I can't hear the stall warning horn over engine noise and headset unless I'm specifically listening for it. Totally useless IMO.