2012 2013 GS 450h MPG 
Green Car Reports
NOVEMBER 29, 2011
It's not yet in dealerships, but the 2013 Lexus GS 450h offers a big boost in gas mileage for buyers of mid-size sport sedans. The all-new GS 450h hybrid is expected to be rated at 29 mpg city, 34 mpg highway, for a combined rating of 31 mpg.
Green Car Congress
SEPTEMBER 14, 2013
At the Frankfurt Motor Show, Lexus introduced the fourth model—and the second hybrid—in the GS range, the GS 300h hybrid, which will be launched at the end of 2013. The new GS 300h is equipped with a second-generation Lexus Hybrid Drive system similar to that installed in the IS 300h. l/100 km (50 mpg US ).
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