You also have to figure in all the improved technology which could be put in a Lotus XI-type car. Notice little comments in that motor article about carburetors (carburetors?!?!) without chokes (Daddy, what's a choke?), an engine that doesn't consume much oil (nowadays I put 2.5 quarts in my Insight at an oil change, and take out about 2.49 quarts 7500 miles later).
Suppose you build a Lotus XI clone using modern technology: what sort of performance & fuel economy would you expect? Even the current Lotus cars, over-engined as they are, score near the top of the annual CAFE stats.
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