Big block cooling question

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Why the annoyance with the FM. It is 50 years old or so. Bet you got some attention on the trip! Enjoy life!

I guess I just expected better mileage with our reg fuel at $5.30/gal. I get range anxiety with only 150 miles per tank.
Does a Barracuda only have a 10 gallon tank?
Went to a interprovincial car show with over 500 cars, Lots of Mopar, My 67 notch was only 1 of 2 there.
Nice to have something a little different.