Too hard to narrow down THE favorite. The ones that would make the finals are:

1970 Honda 600 Sedan (my 1st car - 600 cc 2 cylinder engine sitting on 145SR10 tires - 50+ MPG and at 6' I couldn't put the seat all the way back and still reach the pedals)

1975 Chevy Monza TOwn Coupe (looked like a very boring car but had a factory 350 V-8 that would take a Vette of the same vintage off the line - owned when people started lifting pick-ups and I loved smoking them off the line as well - and in all the time I had it, I never got a ticket in it, though I certainly deserved quite a few)

1962 Willy's M38A1 (stock military Jeep with a top speed of 50 MPH but would climb a tree)

1974 Dodge Sportsmobile pop-top van conversion AKA "The Happy Van" (avocado green inside and out which was seriously out of date in the '90s when we owned it but it was a rolling party with comfortable sleeping for 4 adults)