What my Prius can do with a Tail Wind!

Driving up from Indiana to Michigan, there was a nice strong wind coming from the West.  I filled up after turning East on I-94 off of I-69.

Driving with the wind at my back, keeping the speed below 70 mph, and drafting off of trucks, I averaged 69.4 mpg for the next 96 miles to Royal Oak, as you can see below.

With a REALLY strong tail wind,

I extrapolate that the gas tank would fill up as I drive.