Old Mechanic: I don't know the Prius well enough to say.
However, relating to basjoos' idea, a quick search turned up this:
(Edited for brevity...)
Quote:
I typically set the cruise at 65 and achieve about 49 mpg per trip. Tonight I got behind a 18 wheeler running 70-75 and followed him for about 175 miles or so - following at about 25 ft or closer (not recommended but mildly amusing). My average went from 44.5 MPG (at 65 mph), to 63.5 MPG (at 70-75) [40 miles later] - and it's an uphill run.
I couldn't believe how many 5 minute segments of 99.9 MPG I saw. The battery was 10 bars full green the majority of the way. Several times (at speeds up to 72 mph) the car went into "super-golfcart" mode where the electric motor was providing the sole source of power. I imagine you could achieve better than 75 mpg traveling cross-country using this technique.
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"Drafting" experiment... 50 mpg to 65 mpg, easy! - PriusChat Forums