3 ms·1988 Geo Metro could get like 54 MPG. Impossible to build and sell due to 2023 regulations.by vidanay 4y ago1988 Geo Metro could get like 54 MPG. Impossible to build and sell due to 2023 regulations.zip1234 4y agoWhat regulations would make it impossible now?to11mtm 4y agoEmissions changes and Crash Regs for starters. One can look at the Chevrolet Spark; it is not really much larger than the Metro, but only gets MPGs in the upper 30s AFAIK.