Fun MPG anecdote!
I had a chance to drive both cars over the same route over the weekend: Similar ambient temperatures, but weather conditions were actually worse for the Prius (drizzle, wet/damp roads, breezy).
On gas, the Prius reported 3.0 L/100 km =
78 mpg US over ~95 km.
That's driving with load (DWL), most of the time on cruise control, on the back roads/scenic route, with cruise set at 75 km/h (47 mph) most of the time.
In the Metro, I only managed 3.3 L/100 km =
70.5 mpg at similar speeds.
The Metro's ScanGauge is calibrated pretty accurately. I don't know how accurate the Prius' factory gauge is, but even if it's off by 10%, it would still be even with the Metro, in worse conditions.
Amazing, considering the only mod on the Prius is 50 psi, and the Metro has bags of mods on it.
Even more amazing considering the difference between the 2 cars in comfort, quiet, power, convenience features, safety features, etc., etc.