Slow acceleration

I just moved to Las Vegas from Philadelphia.  I
have a 2018 Toyota Corolla IM. During the
daybtime in 100+ weather my car lags. When I hit
the gas it goes very slow at first then finally
catches up. I went from about 35mpg to 25mpg. I
am a uber driver so I have 50000 miles on the car. I
have no check engine lights and yesterday I
smelled gas outside the car but only for a few
seconds. When the sun goes down the car will
drive normally. And I do have the a/c blasting
during the day. I have driven cars here before with
no issue from the heat.