I know it's a Shouty thread, but since I showed the MCM video without comment, I should point to MCM's production values. These guys started in their driveway, but now they have photoshoots on an acre of seamless paper.
Here's part 3:
They don't talk about fuel economy, but I can see (at 9:00) that thing is sprung so stiff it will rattle your teeth.
I also like Rich Rebuild's since he put the Zero motorcycle engine in a Model A roadster. That one should be quite economical.