I left KFAY on a windy day, westbound at 4000, speed about 110-115. Windy, but pretty smooth. Approaching GSP, I climbed to 6000 for terrain, turned NW towards KDYS and climbed to 9000 for terrain and speed dropped to 95 knots. But it was sundown, temps were at freezing and there were many cloud tops that I wanted to not penetrate, so I climbed to 10,000 msl and speed fell to 68. Once clear of terrain, I dropped back to 4000 and got just above 100 knots Northbound towards LEX. Then I added some east for KHTS and boy did I have some groundspeed!
Outbound leg: KHTW --> KFAY, 2.2 hours. Don't recall, maybe 20 gal?
Return leg: KFAY --> KGSP --> KTYS --> KLEX --> KHTW, 4.7 hours, 41 gallons. At least it was smooth.
As we were crawling along above the highest peaks east of The River at 68 knots, indicating 135 mph [162 mphT = 141 KTAS with my old, battered doghouse], mynwife looked at the 430W and said, " Glad we aren't in a Cessna! We'd be going backwards." That was my first flight over 4 hours [4:42 by my watch], so I was keenly interested in fuel economy. What a trip to visit the inlaws! We were a day late and still deviated around icing in southern WV.