The baseline could be partially scewd due to having the axle backs on at that time but that can't be much there. The graph you posted is right within range of where I was. I couldn't tell ya the temp alt etc. But seattle isn't the highest place that's for sure and weather is mild.
I'm not too sure if ill ever get a run down the strip this summer but a high12 -low13 would be about right from runs I've seen others post. Quickest has been 12.2ish? I believe on e85, don't hold me to that thouh.