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Old 03-05-2023, 02:36 PM   #34 (permalink)
Isaac Zachary
High Altitude Hybrid
 
Join Date: Dec 2020
Location: Gunnison, CO
Posts: 1,985

Avalon - '13 Toyota Avalon HV
90 day: 40.45 mpg (US)

Prius - '06 Toyota Prius
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One thing worth mentioning as it could (???) pertain to any old two overhead valve engine would be adding a second sparkplug per cylinder. I don't know if or how you would do that on a small block Chevy, but it would increase flame speed and therefore efficiency.

This is something that has been done on Type 1 VW engines with good success.
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