do lexus get good gas mileage?

depends on model, but as a rule.yes they do. but not enough to pay the diff your gonna pay for the car. Add it up, its simple. buy it for quality not gas savings.

Depends on your definition of ''good''. l drive a 2005 LS430, and it gets 26 mgp on the highway, but only about 17 in the city.

Even the Lexus hybrid models do not get great mileage. Lexus cars are generally heavy and have performance-oriented engines: think about it. If you can afford to drive a luxury vehicle, you will probably be able to fill up the tank with no problem.

l drive a Lexus SC300 and l get 16 mpg in the city.

you did not specify a model, so l investigated ALL models for you
GS430--------18/25
GS450H------22/25
GS470--------14/18
GS460--------17-24
ISF-------------16/23
IS250----------18/26
IS350----------18/25
LS460---------16/24
LS460L-------16/24
LS600H-------20/22
LX570----------12/18
RX350----------17/22
RX400H--------27/24
SC430---------16/23

depends greatly on the particular model and how you drive it.

but generally, they get better fuel economy than its competitors like mercedes and bmw

yes. l have an is250 and l get great gas mileage!