Around 1987-1988 I had a Ford Fiesta/Festiva. I was in the Army and regularly made weekend trips, driving from southern California to Central Washington a trip of about 1200 miles. I would leave in the evening at the end of the work day, and drive straight through (I was younger then). This little car would do well over 100mph, but was very happy strolling along at around 100 and it would get 40mpg doing it! at the time, there was almost no police presence on I-5 in Oregon at night. I would make it across the state 308 miles in 3 hour plus or minus a couple minutes, with a gas stop.
The car is long gone, the memories of the trips and that fantastic gas mileage are still with me. I am pretty sure it was a Ford Fiesta (first generation) I bought it used in about 1987, and drove it until I blew a head gasket (I recall it was of European decent).
30 years later, there are some cars that make claims of 40mpg, but in the real world I don't think any pure gas cars really do. As an example The 2016 Honda Fit is advertising 41mpg hwy.
30+ years later it seems reasonable we should have entry level cars, that easily meet and surpass this. It seems like I should be able to buy an inexpensive car that will cruise at 75mph and get 60mpg, why can't I?