We're not the only fuel economy forum hearing crickets these days:
I also keep an eye on CleanMPG and GasSavers (RIP... now Fuelly's forum), and activity on those has also tanked. Pardon the pun!
We're still more active than those two by most measurements though.
Nevertheless, EM's "Active member" count (members who have signed in at least once during the previous 30 days) is also at an all-time low (not counting our first few months).