Ben, this is a little bit of an old thread but timely nonetheless.
I'm researching a gravel bike and came across a review of the Panaracer Gravel King SK 35 at Gravel Cyclist. JOM had some really nice things to say about the tire including the fact that he thought they were extremely fast.
"On the other hand, the 700c x 35mm version of the Gravelking is a rocket. Over 120 grams lighter, and with a casing that measures at least 38mm on every wheelset I tested them on, they are fast. Just like their bigger brother, they roll fast over just about everything, but with the added advantage of fast acceleration.
An additional surprise was how well they rode across sandy roads. Without doubt, this was the fastest rolling “narrow” tyre I’ve ridden on gravel when sand is present on the surface. I was impressed with their performance. Suffice to say, I like the 700c x 35mm version of the Panaracer Gravelking SK a lot."
So far this is the first tire on my list.
-Tim-