I worked out some Lancaster County puzzle caches on Wednesday. Since I passed through Leola on my way home and since the solution to "Carl Friedrich Gauss" pointed to a roadside spot that seemed safe to access at night, I did that one as an after-dinner cache. I'll have to return to Leola during the day for the other puzzle caches.
And finally, I have an MPG measurement using E0 gas on this Lancaster round-trip. Apparently, my car gets 7% better MPG when I switch from E10 to E5 gas. It's E5 because I had half a tank of E10 when I added E0. This is a significant result because going by energy content alone, I'd expect a negligible difference of about 1.5%. However, I have to make more measurements in case this one is a fluke. Another excuse to go to Lancaster again. :)