HP needed to go 65MPH?

[KLP]

I am a newbe to your web site and this is my first question. I am wondering if we have any engineers on here who can give me an approxmate HP needed to propel a 2500lb car on a flat out highway at 65 MPH? I know their are many variables that will affect the answer such as aero and roll resistance among others, but if I could just get a ball park figure. I am asking this because I am thinking of building a project with a lightened up small car such as a toyota tercell or honda civic and would like to put in as small of an engine as possible (maybe a briggs or small motorcycle engine) that would let me drive highway speeds. My daily commute to work consist of 25 miles interstate and 5 miles street driving. I may even install an electric motor to help with inital acceleration if needed and then let the small gas engine take it at higher speeds. My second idea is to install a larger engine in a very light weight car and run a very high gear and final drive ratio to run the engine basically at almost idle at highway speeds? Any thoughts, ideas, suggestions??? Thanks