Sad to say . . . and hate to be negative about this. But today's vehicles have placed more pressure on MPG attainment and less on how that is going to be accomplished reliably in the long term.
Eight, nine, ten speed transmissions, smaller turbo engines working at higher limits with more parts, cylinder deactivation, Start/Stop.
All those things and more, along with the glitzy superficial technology "toys" people are gah-gah over do little for vehicle longevity let alone, problem free performance.
Remember when "Maintenance Free" became an advertising and selling point back in the '70s? No tune ups for 100K miles, long lasting maintenance free batteries and more.
Even the batteries today have shrunk in size with thinner lead plates packed tighter together in order to save some weight. But I read of many early battery failures . . . although sometimes due to faulty electrical vehicle systems that go wrong. I recently read of a "battery draining issue" where an owner was plagued for months of the battery draining in 24 to 36 hours due to a shorted A/C pressure sensor. It was only found by a tech who had a wiring diagram and started disconnecting all kinds of unrelated circuits until the short revealed itself.
Even the 6 speed transmissions that finally became pretty decent now have "TCC" which is a combination of the old lock up torque converter along with a kind of flimsy clutch surface that will likely not go much over 100K miles if that.
The 6 speed transmission in the 2010 to 2017 Equinox, Terrain, Traverse, and GM cars is not the same as the 6 speed transmissions GM has today. They do not shift as smoothly and as predictably as the older units. Those older units had the "wave plate" issues that eventually were mostly resolved. Today's 6 speeds. . . who knows.
Ok. . . so much for the cheer. But after reading across half a dozen GM vehicle forums for several years now. . . . that is how it seems to shape up.
The cost of MPG attainment and technology? If anything spurs on EV it will be the break downs of the current ICE drive trains and poor durability. Maybe that's the plan? Throw a battery and electric motor(s) in a vehicle. . . . less mechanical to go wrong and big government credits.