Interestingly, there's some seriously different claims for this engine in the PA28.
One site say 22.1 l/h at a speed of 110 KTAS (70% power, 6,000 ft.), and a pretty leisurely climb rate to 6,000', of approximately 658 ft/min ... yet another says 18.11 l/h, with no speed mentioned (might be throttled back to 90kts?), and a more interesting climb rate of 830 ft/min.
A TBO of 1200hrs isn't particularly impressive - and there isn't too much to get excited about overall - apart from being able to rob a construction site for fuel, when you're stuck.
One also has to ponder the amount of stresses inside a pretty ordinary, automotive-based, L-4 design 2.0L engine, that's producing a constant 155HP, too.
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Centurion 2.0 S | Aerojet Baltic