This is probably not related at all
except for telling what New England winters can do to your car.
I just had 75,000 mile regular servicing on an '07 Camry,
and they talked me into spending another $200 to replace
a corroded fuel tank protector shield.
I'd make sure it's not preignition. Your knock sensor may need
attention. My old pickup does the same thing with cheap gas. Even the
lawnmower will knock sometimes under load but that one really sounds
like a hammer knock.