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As for the moorsickle exhaust it depends on the engine and the placement of the ex-over pipe.
Hardleys seem to like a small diameter pipe with a xover nearer the heads.
The size of the carbytooty matters, too.
On Moto Guzzls they like the xover back past the transmission and then the distance of...
Okay....back in the 70s both the 72 and 73 Chargers with 2.76 gears would reliably get 20mpg. So did my 383/4 Sport Fury with 3.23 and dual point while running the air.
And, believe it or not a friend's 70 440 Charger with RV cam and 4.10s would get 20 at 55 mph. Took a bunch of tuning to get...
You said mountain cruising. At what altitude do you live?
I bet your carb needs to be rejetted for the altitude. And as altitude goes up octane requirements go down.