My Laser with EFI has stopped pinging under hard throttle with E10 and has a bit more pep and less laggy feel than before.
Plus a servo around here often charges a bigger difference for E10 that it cancels out the extra consumption that a 2¢ difference won't.

It's not like the good old days of before covid when they sometimes changed 16¢ a litre less but I got it the other night for 6¢ less than their 91 unleaded which was on the cheapest level in my area.

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!