Buick LaCrosse is getting improved mild eAssist for 2018

The number of cylinders has little direct tie in to efficiency or power.

2017 GM I4 2.0L economy engine = 275HP / 295ftlb - 22/25/31 mpg 3410lb
2017 Toyota V6 3.5L economy engine = 268HP / 246ftb - 21/24/30 mpg 3480lb

I would say virtually identical.

DonC said:

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Also makes one wonder why Mary Berra has taken the lead trying to change the CAFE standards.

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It's a very old problem. Some folk believe car companies should only make cars people do not want to buy. Car company folk and the public want cars that serve the actual market.

So it's a compromise. Most car companies are making both. The new tighter CAFE goals were to be evaluated as time goes on. The fleets are still improving their economies, even the 'guzzlers' are achieving higher MPGs as time goes on. The question is how fast should we transition without destroying the US economy. Yes, a massive depression would reduce emissions, but might also reduce government programs.