Very impressed with gas mileage

Bewy said

They had similar trials here & the Slant won from memory. Not hard to see why..... The long runners on the Slant [a] improved low end tq & evened up the runner length. The two other contenders were the local Holden & Ferd inline sixes. The Ferd in particular was about as inefficient for power & economy as you can get......The intake manifold resembled a 2 .5 ft length of water pipe with runners running off at 90*.

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The sixes were designed for economy. I believe the Holden and American six intakes were similar. They functioned well enough to get air/fuel to the cylinders but were not as good as the slant six manifolds. The Ford design was about like someone with a 4" rectum crapping in a toilet with a 3" sewer pipe. You could sort of get it through but that is about all you could admit to.