I bought a used 2001 Pirus with 50,000 miles. I've only had it a week. On my first tankful of gas I got 39 mpg. Under certain conditions...in the 20 - 33 miles per hour range...the car appears to lose power....it's sluggish. It's especially sluggish when I decelerate from a higher speed into the aforementioned speed range..and then attempt to accelerate. There's no engine knock...just a draggy feel....that slowly but surely clears the more aggressively you step on the pedal. Is this normal for the hybrid technology? Could there be something wrong with this automobile? I'd appreciate some observations and advice.