Well put Earl.. An interesting side note here. I LOVED running the empty spaces out west on my MK1's in triple digits. One sniff of that wonderful desert air and all my MK1's would be begging me to give them some rein and let em buck, which I liked to oblige. After the kids grew up and moved on to lives of their own so they were no longer riding with me and Tip started owning the back seat she immediately noticed this phenoma and after an afternoon of 115 across that vast openess said "I am really not comfortable with these high speeds" to which I said "well if your not enjoying this I am not enjoying this" then I said "so,, pick a speed limit you are comfy with and thats where we will ride".. Remarkably. Tip picked 100 mph as her roll of comfort lol. So from that day forward, unless she was leaned back on Tweeks rear trunk and sleeping , Tweeks got governed at 100. As @skydoc_17 mentions, maintaining those speeds always showed reduction in economy. We dropped from +40 mpg to below 30 mpg, usually around 28 mpg.. Now touring in Trooper (who seems to have aquired the same taste for remote desert region high speed travel), our Hybrid car, our highway mpg of +60 also drops significantly when moseying along at 100 mph. It drops to 51 mpg in that same senario so it seems Earl, your thoughts on the matter apply equally in the science of miles per gallon analyzing..