HP needed to go 65MPH?

[GasSavers_Ryland]

I have a watt meter on my comuti-car, it's a 1,400 pound car that is rather brick shaped, so I figured that if one horse power under ideal conditions is 750 watts, then with all the losses that I could have then 1,000 watts is more accurate, cruising down the road at 35mpg takes 6,000 watts, hit a slight slope and it jumps to 10,000 watts, going up the hill to get to my house it slows down to 20mph and is drawing 20,000 watts for almost two minutes, granted this is all at lower speeds, but if air drag is squared as speed increases.