I actually had a tank that was below 30MPG in my Prius. 2 bikes on a rear rack, doing ~80MPH with hills and I think a decent headwind. That was also the only time it wasn't able to maintain the speed I wanted while going up a particularly long and steep hill. Battery was drained from going up previous hills and even though I had the cruise set at ~80MPH, the speed slowly started to drop. I wonder how other cars would fare when pushed to their equivalent limit. I've had it at or near redline for minutes at a time going up hills, never any problems.
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