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The two-week fuel-economy average we got for this 2009 Toyota Prius was 39 mpg, slightly below what we've previously recorded. Our best tank returned 49 mpg (beating both the EPA's city and highway estimates), and on one city stint, the driver managed a steady 54 mpg for almost a hundred miles. One driver even stacked the bar graph display with four columns of 100 mpg economy.
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On the road, what the 2009 Volkswagen Jetta TDI lacks in horsepower, it makes up for in torque and efficiency. Our best tank returned 40 mpg (matching the EPA's highway estimate), and its two-week average was 36 mpg.
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. . . (By the way, there are ways to game the display to trick your friends into believing you are a god of efficiency.) . . .

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To make a long, boring story short, the Prius netted 54.4 mpg to the Insight's 51.5 mpg during our driving loops. . . .

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Our score? Over 675 miles in the Prius, we averaged 42 mpg, with a best result of 51 mpg on one tank. In comparison, the Fit returned an average of 28 mpg over 800 miles with a best tank of 38 mpg.
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Round 1: Best Back-Roads Cruiser
The champ: VW Jetta TDI at 47.3 mpg
2nd Place: Toyota Prius, 46.0 mpg
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Round 2: Best City Roller
The champ: Toyota Prius at 52.4 mpg:
2nd place: Smart Fortwo, 34.0 mpg
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Round 3: Best Highway Flier
The champ: VW Jetta TDI at 48.9 mpg
2nd place: Toyota Prius, 47.7 mpg
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Round 4: Lowest Fuel Costs
The champ: Toyota Prius, $53.32 of regular gas with a trip average of 47.7 mpg
2nd Place: Smart Fortwo, $66.37 of premium gas with a trip average of 40.0 mpg
. . .
Round 5: Greenhouse Gas Smackdown
The champ: Toyota Prius, emitting 0.18 ton of greenhouse gasses
2nd Place: VW Jetta TDI, emitting 0.19 ton greenhouse gasses