basjoos,
The xA engine is a 105 hp, (i think) 103 ft-lb engine strait from the echo along with the transmition. To keep the acceleration numbers decent, the lowered the final drive ratio. Match that w/ a higher CD and fuel economy suffers pretty badly. That and VVT-i is not as efficient for power to volume (little better on torque though). So at cruising speed w/ the same power engine, the engine is pumping more air......more air equals more gas, more gas equals worse economy. Thats my take on it anyway.
cheers,
Steven
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