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2018 Lexus GS 450h — 3.5L 6-cyl, AV-S8 automatic, RWD
This 2018 Lexus GS 450h (3.5L 6-cyl, AV-S8 automatic, RWD) takes premium gasoline. PREMIUM
31
MPG combined (29 city / 34 hwy)
$2,500
est. fuel cost / year (EPA, 15k mi)
283 g/mi
tailpipe CO₂
The EPA lists this trim as premium because that's the fuel the manufacturer specified for its mileage test. Many such engines will run on regular with slightly lower power and MPG — but check your owner's manual to see whether premium is required or just recommended.
EPA fuel type: Premium · class: Midsize Cars · retrieved 2026-06-14.