Emissions controls do not make for good fuel economy, and emissions standards have gotten (rightfully I think) strict.
Furthermore, gas hasn't been expensive for very long, markets are not infinitely, instantly adaptable to such price swings.
And, let's not forget, the EPA used different testing methods, the VX only got 45 by today's standards, and it was the MPG king of the time. You had to pay a premium for it just like you do for hybrids now.
*shrug*
Where have the consumers been demanding more fuel efficient cars?
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