johnsnownw
Elio Addict
I'm curious. Name one "off-the-shelf engine" they could have used.
I'd pose that question to Elio, as they didn't cite the lack of availability of an off-the-shelf engine as the reason for the switch:
As the team began to dive into some of the details and changes to meet the desired Elio targets, one thing became apparent: the Geo Metro engine would not meet the fuel efficiency targets to enable the vehicle fuel economy goal of 84 MPG highway.
https://www.eliomotors.com/the-elio-engine-part-1/