Your favorite rear end/final drive ratio and why?

OLD IRON said

Yep, the one ton 360 with 4.88 and 245/75-16 tires is turning 3600 rpm at 55. But it's worth it to tow the 14000-pound backhoe around the county. It's under all axle and 26000 restrictions. But way over what Dodge says it can tow. It don't care.

I don't think economy with the 1964 413 New Yorker is part of the program with any rear gear. It gets 16 at 70, no wind, no hills, good tune, stock carb. And to top it off, must use premium 93 gas.

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After my youngest brother was born a Valiant just did not function for two adults and four children from newborn to 14. So dad traded the Valiant for a 67 Merc Montclair in 69. Had a 390 2V. Probably 2.75 gears. I ended up with a 65 Galaxie more door with the 390 4V and 2.75 gears. Both got about 20 MPG US. Mine has a burned valve and it still got that mileage. Used to put $5 premium in and fill with regular with no problem. Could probably put $20 of 91 in and fill with the "cheap" stuff. Is better than an 80 LTD wagon with either a 302 or 351W in it.