The bad news is I won't be able to offer any more insight into Echo fuel economy.
The good news is the new owner just drove away in it. The
fleet size has dropped by one - anti-hoarding in process!
Good guy, too - he'll definitely look after it. He said the very first thing on his list is to thoroughly rust treat it. Sounds like it'll last a long while in his care.
Last pic, moments ago:
Red winter wheels/tires on, summers loaded into the back.
Sayonara, Echo! I hardly knew ya.