Manufacturers and car tests used to publish a chart for fuel consumption versus speed for a given car.

I’ll tell you ... they were PO’d. In 2006 I bought a 2000 Europa G500 that the original owner paid $145,000 for only to find out that MBUSA wouldn’t work on it. In perfect condition and 63K on it, I paid less than $30k because the values of all but the SWB models dropped like a rock when the “real” Mercedes models…