318 MAX fuel economy builds?

mpgmike said

As far as the heat chamber under the carb, Smokey Yunick did a rather elaborate design using a turbo back in the mid-80s. He was getting over 50 MPG with around 250 HP from a Fiero, Plymouth Horizon, and a European Fiat:

Smokey Yunick’s Hot Vapor Fiero; 51 mpg and 0-60 in less than 6 Seconds! See and hear it run in our exclusive VIDEO! - Information on collecting cars - Legendary Collector Cars

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The owner of Hill Country Performance in Spring Branch, TX owns the Plymouth Horizon, and has a 'micro museum' in the store to Smokey. Danny is fricking awesome in overall engine knowledge and machining. Does plenty of in shop 'how too' on YouTube. Here's a vid with the motor.