Hudson, Lincoln, Nash, and Mercury
Equipped only with standard transmission and drive gear ratio, the Mercury established a remarkable stock car economy figure of 23.35 miles per gallon which bettered the marks of 15 of the 22 other finishing cars, a majority of which carried overdrives. Mercury consumed no oil.
The Lincoln won, Marshall Martin was the driver
https://libwww.freelibrary.org/digital/search/?q=Gilmore-Grand+Canyon
read all about the Gilmore years online in the Google Books:
The Mobilgas Economy Run: A History of the Long Distance Fuel Efficiency ...By Dave Hermanson
In the one image the technician is cc-ing the head to check the combustion area in the head. These cars were undoubtedly balanced, head cc'd, cam degreed'd and whatever else would make them run smooth and freely.
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