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Today's high tech in car engines is 40 years old on ships, for example common rail injection, has been used in ships really long time before in cars.
Surely there is now more electronics, but it does not bring so much new or advantage, most of things can be done as well mechanically, just much more reliable and bit more expensive.
Only way to better economy of big motor is some way to shrink amount of cubic inches, when not all of that is not needed.
Saab had variable compression ratio motor near production before they did ran into problems, maybe we see some day variable displacement too.
Methanol injection might do some good, but it is not a miracle, also Espace(Escape in US?) weights so much, that any amount of city driving will kill the mpg, it is also so big that there is really lot of frontal area, it is really challenging to get any good mpg.
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