There must be 200 models now with 20+ options providing for 10,000's of options.
Apparently, it may take years for one to decide whether a 4 or 6 cylinder is optimum for the next 15 years.
After all, one only needs a 4 cylinder if there is a driver and 2 passengers are riding.
However, it's not going to work optimally when there are a total of four people riding in the mountains.
Of course, out of 200,000 miles one might drive in ~15 years,
the extreme case of an engine being 'maxxed out' may only apply for 3,000 miles / < 2% of the time.
I guess going 59 MPH instead of 66 MPH for a total of 50 hours in 15 years is going to be an interesting dilemna to face
when one tries to determine which of 10,000's various auto characteristics permutations one might foresee
in selecting that efficient, favorite brand, optimum vehicle.
I'd buy that comfort machine that's going to satisfy me > 96% of the time/ a.k.a. 2,880 hours out of 3,000 "summer time hours"
and be prepared to enjoy the temperature over 79'F inside for ~120 hours a year when it might be > 99'F outside.
Of course, I'll probably be working, visiting, shopping, in the pool, at the beach or at the movies half that time,
so I won't even notice the 80'F inside for 60 hours of the total.
And if my $30 fan doesn't satisfy me with a little more cooling,
I can always go to the bar and talk about my dilemna.