2016 Hybrid Camry MPG has gone down

Since owning my 2016 Hybrid Camry, i've noticed that it's changed in
behavior over the couple years i've owned it. The same trips I used to take,
which would be driving about 35 miles apart, i'd get on average 41 MPG now
has gone down to 35 or even 32 MPG. Trips in general have seen my MPG
go down from 20%-25%. None of the dashboard gauges and lights come on
and whenever I talk to the Toyota employees no one has heard of these
issues before or they just tell me it's my cars computer changing, but I just
don't see it happening. Pretty much at my wits end at what to do, replaced
tires, changed air filters and made sure oil levels are good.