[RedDevil]

Up to about 2 years ago I thought Prius drivers etc. were driving slower than average, as I overtook herds of them driving at a speed just below what would get me a speeding ticket.
(that strategy misfired sometimes - adding to motoring costs, but nvm.)

Then my wife lost her job, so I had to work fulltime and save money at the same time.
I already tried everything to improve FE except driving slow. Then I started doing just that. Took some getting used to, but now I happily roll along in the slow lane in the pace of whatever is giving me an excuse to go that slow. It worked

Now I see those Priuses speeding by.

Point is, you will only meet cars that move at a different pace than you do. The cars that move your pace stay away as far as they started all the time.
If you see speeding Priuses it means you move sufficiently slow to be economic
Ah, and I drive a Hybrid, silly me