According to Edmunds gas mileage survey, this 2013 model year averages among its viewers 21 mpg on premium fuel. Squeaks and rattles and occsional power equipment issues are the only concerns reliablity wise (Lexus is one of the top brands in reliablity). It won't be a money pit as far as repairs. As far as gas consumption, it is not the best.
I chose to buy recently a Buick Envision (2018) at a $13,000 discount since the 2019 launched with some substantial changes on May 1, 2018. I average in comparison 24 mpg and it is considered a slightly below average gas mileage average for this day and age (the new 2019 Envision corrects this by moving from a six speed to a nine speed automatic which will probably raise the average gas mileage 1-2 mpg).
It is a good deal and I would take it myself if that was available to me (and I just bought a new car... which I do like a lot with all its luxury features I never had before).