Best by Class

Starting with the latest model year, these vehicles scored highest in their vehicle class.

Year	Make	Model	Specification	Emission Standard	MPG City	MPG Hwy	Green Score	Class Ranking	Class
2022	Genesis	G90 RWD	3.3L 6, auto stk [P]	LEV-III ULEV125 / Tier 3 Bin 125	17	24	38	Below Average	Large Cars	Details
2022	Maserati	QUATTROPORTE GT	3.0L 6, auto [P]	LEV-III ULEV125 / Tier 3 Bin 125	16	25	38	Below Average	Large Cars	Details
2022	Maserati	QUATTROPORTE MODENA RWD	3.0L 6, auto [P]	LEV-III ULEV125 / Tier 3 Bin 125	16	25	38	Below Average	Large Cars	Details
2022	Mercedes-Benz	S 580 4MATIC	4.0L 8, auto Awd [P]	LEV-III ULEV70 / Tier 3 Bin 70	16	25	38	Below Average	Large Cars	Details
2022	Porsche	Panamera 4S Executive	2.9L 6, auto Awd [P]	LEV-III ULEV70 / Tier 3 Bin 70	18	23	38	Below Average	Large Cars	Details
2022	Porsche	Panamera 4S ST	2.9L 6, auto Awd [P]	LEV-III ULEV70 / Tier 3 Bin 70	18	23	38	Below Average	Large Cars	Details
2022	Genesis	G90 RWD	5.0L 8, auto stk [P]	LEV-III ULEV70 / Tier 3 Bin 70	16	24	37	Below Average	Large Cars	Details
2022	Maserati	QUATTROPORTE MODENA AWD	3.0L 6, auto Awd [P]	LEV-III ULEV125 / Tier 3 Bin 125	16	24	37	Below Average	Large Cars	Details
2022	Genesis	G90 AWD	5.0L 8, auto stk Awd [P]	LEV-III ULEV70 / Tier 3 Bin 70	16	23	36	Inferior	Large Cars	Details
2022	Mercedes-Benz	S 580 4MATIC Maybach	4.0L 8, auto Awd [P]	LEV-III ULEV70 / Tier 3 Bin 70	15	24	35	Inferior	Large Cars	Details
2022	Porsche	Panamera GTS	4.0L 8, auto Awd [P]	LEV-III ULEV125 / Tier 3 Bin 125	16	22	35	Inferior	Large Cars	Details
2022	Porsche	Panamera Turbo S / Exec / ST	4.0L 8, auto Awd [P]	LEV-III ULEV125 / Tier 3 Bin 125	15	22	35	Inferior	Large Cars	Details

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auto cvt

denotes continuously variable automatic transmission.

auto stk

denotes manually adjustable automatic transmission

[CNG]

denotes Compressed Natural Gas

[P]

denotes premium gasoline.

[D]

denotes diesel

Emission Standards:

A listing with two emission standards (e.g., Tier 2 bin 5 / ULEV II) denotes a single vehicle carrying both a federal and California emission certification. Green scores for such listings reflect the cleaner of the two certifications.

Battery-Electric Vehicle Fuel Economy:

Fuel economy for pure battery-electric vehicles is provided in miles per kilowatt-hour.

Plug-in Hybrid Fuel Economy:

Fuel economy for plug-in hybrids is provided in miles per gallon for gasoline operation and in miles per kilowatt-hour for electric operation.

"...It's easy-to-use rating system makes it a snap to see the green from the mean. So enlighten your mind and free your lungs and check out ACEEE's Green Book before you buy."

Motor Week, Maryland Public Television

"For those of you who are more inclined to buy green than you are to drive through it as fuel prices rise, I can recommend no better resource than ACEEE's Green Book...[It] offers solid, practical, well-researched, balanced advice."

Warren Brown, Washington Post

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