2014 Prius Mech advice? Bought Used noticing 2 strange things?

Hi all, so I had a 2014 Prius with 90k miles on it. got hit by an 18-wheeler and they totaled the car. I loved that car.

anyway, I found a 2014 just like my old one with 55k miles on it at a dealership. I took it for a spin. It runs great in the city... I had two shade tree guys take it out, look under the hood and they say it's in great shape. I bought it.

Its been great BUT... here's my weird thing I'm noticing that's different from my last one... when getting on the freeway, the engine ROARS a lot louder as it climbs to 50-80mph. like it's working harder than it should.

Also, another weird thing... I can really feel the engine working in the vibration on the floor board under my pedal feet -- it's strange. I dont recall that in my old prius.

so am I crazy, and being too fussy? maybe its just the FEEL of a different car? and dont worry?

I ask because I want to do some long haul drives +400 miles, and just want to be sure it's ok. I may take it to the Toyota dealership tomorrow for one last look to be safe?

thank you for your advice!!