Drove 540 miles with still two pips left on the fuel guage in the MFD. MFD read 64.5 (with only the last 450 miles tracked .. I had cleared the MPG reading when the ODO reading was about 110 miles). Apparently, I must have done real bad on the first 110 miles, since the pump MPG number that I calculated was about 55 MPG.

I know that there might be some discrepancy in the values that MFD displays and the number at the pump .. but this is too big a difference ..

Regardless, I am happy that I could get the combined Hwy/City EPA's MPG mark on my first tank. It probably might be also attributed to the warm temperatures of Houston (80-90). I wonder whether the Prius's efficiency will see a detirioration when the temp. climbs above 100?? Anyone has any data on that?

Anyways. Just wanted to let those of you who doubt on Prius' performance know that I did get the EPA numbers on my first tank, and it makes me tremendously pleased!