Effect of anti-smog devices
I have a 1987 Falcon 190 with a Ford 351W engine. I bought it sight unseen from a fellow in the Midwest. I didn't realize it, but it was unlicensed. I brought it home and ran it through Department of Environmental Quality prior to getting plates.
It flunked. It flunked badly. Took it to a mechanic, and every single smog control device had been defeated or removed. No catalytic converter, no smog pump, no nothing.
Spent a small fortune, new carb, well new everything, plugs, distributor cap, rotor, etc. and so on, and it passed with flying colors. It's legal, has plates, I drive with a clean conscience.
Now, I swear, with a limited, maybe quite inaccurate, sample, I get 14 mpg around town. New the van, not the RV, but the Ford van claimed 11 in town and 14 on the highway. If that holds up it will be very, very nice.
I think I'm writing this hoping it will happen. I am suspicious, but maybe if I say it often and loud enough it will come true.