Ron Wanttaja wrote:

Don't get too hard over on fuel efficiency. Yes, it's certainly nice to burn
less gas for the speed, but in all likelihood, your other expenses will be
higher than your fuel bill for these small engines. Heck, my annual fuel bill
is about a quarter of my hangar rent.

A KR-2 doesn't need a hangar. A big rural mailbox will do:-)

These are tiny airplanes. Pictures don't really make the point;
you have to see it to believe it. Because of that, their usefulness is
limited. And because of that tiny size, they get good fuel mileage.
Can't have everything, you see.

Wooden airplanes are nice (I have a Jodel D-11) but you have to
keep them out of the weather. Damp does them no good at all. The sun
destroys the fabric and finish. The Jodel was left out in the weather
for a very few years, and I had to rebuild it extensively.

And wood has gotten so expensive (and hard to find in some
places) that metal looks better all the time. Especially for someone
like me who, early on, developed a nasty reaction to the epoxies used
in composite construction as well as a wood glue. Totally screwed up my
immune system and I wound up with allergies I'd never had before.

Dan