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
2020	Chevrolet	IMPALA	3.6L 6, auto stk	LEV-III SULEV30 / Tier 3 Bin 30	19	28	43	Above Average	Large Cars	Details
2020	Porsche	Panamera	3.0L 6, auto [P]	LEV-III ULEV70 / Tier 3 Bin 70	20	28	43	Above Average	Large Cars	Details
2020	Chrysler	300	3.6L 6, auto	Tier 3 Bin 125	19	30	43	Above Average	Large Cars	Details
2020	Dodge	Charger	3.6L 6, auto	Tier 3 Bin 125	19	30	43	Above Average	Large Cars	Details
2020	Chevrolet	IMPALA	3.6L 6, auto stk	LEV-III ULEV70 / Tier 3 Bin 70	18	28	42	Above Average	Large Cars	Details
2020	Porsche	Panamera 4	3.0L 6, auto 4wd [P]	LEV-III ULEV70 / Tier 3 Bin 70	20	27	42	Above Average	Large Cars	Details
2020	Porsche	Panamera 4 Executive	3.0L 6, auto 4wd [P]	LEV-III ULEV70 / Tier 3 Bin 70	20	27	42	Above Average	Large Cars	Details
2020	Porsche	Panamera 4 ST	3.0L 6, auto 4wd [P]	LEV-III ULEV70 / Tier 3 Bin 70	19	26	42	Average	Large Cars	Details
2020	BMW	740i xDrive	3.0L 6, auto stk Awd [P]	LEV-III ULEV125 / Tier 3 Bin 125	20	28	42	Average	Large Cars	Details
2020	BMW	745e xDrive	Electric (Li-Ion) / 3.0L 6, auto stk Awd	LEV-III ULEV125 / Tier 3 Bin 125	1.54 / 19	1.80 / 26	42	Above Average	Large Cars	Details
2020	Mercedes-Benz	S450	3.0L 6, auto [P]	LEV-III ULEV125 / Tier 3 Bin 125	19	28	41	Average	Large Cars	Details
2020	Cadillac	CT6	3.6L 6, auto stk Awd	LEV-III ULEV70 / Tier 3 Bin 70	18	27	41	Average	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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