MathGirl,
I have number of era collector cars that I tour with
1911 Ford Model T touring cruising speed 30-35 Mph 15-18 mpg (ruckstall rear end would add 10 mph)
1912 McLaughlin Buick Model 35 cruising speed 30-40 Mph 15-16 mpg
1936 Ford Phaeton cruising speed with 4:11 rear end 45-50mph 15-16 Mpg(Columbia rear end would add 15 mph
1948 Cadillac flathead 4 speed Hyrdramatic cruising speed 65Mph, 10 mpg(this what I hear from others as mine does not run yet
1957 Ford Thunderbird with 312cu, 3 speed manual with overdrive cruising speed 65-70, 16-20 mpg
1966 Chevy Impala convertible 327 four barrel cruising Power Guild speed 70 mph or more, 15-17 mpg
1967 Chevy Camero rs Convt 327 Two barrel cruising Power Guide cruising speed 70 mph, 14-16 mpg
1970 Chevy Corvette 350 4 speed manual cruising speed 70 plus, 16-19 mpg
1996 Buick Roadmaster 350 Lt1 4speed automatic overdrive cruising speed 70 plus mph 20-23 mpg not towing 7-8 mpg towing a 4500 pound covered trailer.
all mpgs are either highway speed with the newer cars or tour at slower speeds. Not a lot of city stop and go when I check mileage. Small block Chevys V8 or Ford YBlocks and later small blocks from the mid 1950’s to 1970 will keep up modern traffic and get at least 15 mpg and have the best part availability. But if you only run a 1000 miles a year gas mileage is not a big deal. None of mine except the Roadmaster have ac
Tom