The twin-engine Twin Star, at 80% power and 18,000 ft altitude, flew 201 knots true airspeed while consuming 11.8 gallons/hr. That means the diesel-powered plane got 19.6 mpg while traveling over 231 mph.

At 75% power and 10,000 ft, the airplane's absolute range is 1,012 miles with standard 52-gallon tanks. The 74-gallon long-range tanks boost that range to 1,440 miles. But with the standard tanks and minimum power settings, the theoretical maximum endurance is 19 hr and 2,532 miles, which is farther than from Chicago to Los Angeles.

Loaded to just 15% below maximum gross weight, the Twin Star climbs more than 2,000 fpm at 90 knots. At 110 knots, the climb rate is 1,700 fpm. Single-engine climb rates to 12,000 ft averaged 600 fpm.

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