is this an all out mpg car? seems so because you chose the 3cyl. are you going to modify an existing car?
i've considered it a few times, if i were going to spend the time, effort, and resources to build myself a car. it would have to be fun to drive. i think either taking an aero sedan and making it a small truck or using an old dodge rampage as a base and putting a v6 in it with a tremec 5/6 speed would be ideal. im confident a good v6 in an aerodynamic vehicle with the proper gearing could easily do 50mpg highway.
__________________
|