Let us know. Do you mean Zero says your lower mileage at higher speeds indicates something is wrong with the battery? Far as I know, you are the only one who has posted info about how fast the battery is depleted at higher speeds, yet that is what I think all of us want to know....what is the range at 80 mph indicated? That is highway commuting speed where I live at least. Somehow, when this question gets asked, it gets turned into range at 45 mph or something else, or includes lower speeds to get up to speed. No, no. I just want to know how long the big battery can go at an indicated 80 mph, flat surface, 200 lb. rider. I have a feeling the range is going to be quite low...perhaps 30 miles, but hopefully somone will let us know. In other words, we want the worst-case scenario or close to it...not the best-case scenario. I can easily take a Zero S onto W I-10 between San Antonio and El Paso and run it 80 mph and never even see another car let alone have to slow down if that's what they need. The speed limit there is 85 mph so I wouldn't even have to worry about a ticket. LOL