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W116 Such Gas Hogs. Why ?

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Motorman:
Howdy
Still considering rescuing a 1973 450 SEL.
It’s my understanding that these are quite thirsty when it comes to petrol.(12 mpg).
I would use it as a weekend putter so it wouldn’t be drinking too bad.
At least as a low compression engine it should do well on non ethanol regular gas.
Anyone have some ideas on why they were such consumers ??
Thanks for your thoughts.

daantjie:
12mpg is more 6.9 territory.   A well sorted 450 should be getting better than that.

ptashek:
12mpg for a 450 is quite a lot.

I think 13 is the worst I ever got in regular use, and normally closer to 14.5 - 14.7. That's on a euro engine.

But yeah, they're hungry however you look at it.

rumb:
That time period emissions control systems were crude and usually at the expense of performance.

You should be measuring smiles/miles instead.

90077merc:
Do the 450 SELs run better on low ethanol gas? Where do you find that?

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