I just did a long highway trip in an MX-5 and got about 38 mpg on the recommended 93-octane gasoline. I was not driving the vehicle to optimize for mileage. The article quotes the same. I mention it because it is an obtainable 38 mpg.
Driving long distances on the freeway typically is the best way to optimize for mileage though? at least seems you couldn’t have been going too fast ;)
Must’ve been fun in the mx5