Miles/gallon: Newer vs Older Cars
That 100 mpg carb is impossible only scooters can get that mileage.
It takes a certain amount of hp (fuel) to move a car of a certain weight and aerodynamics.
The biggest factor that changed mileage for newer cars on Highway is overdrive.
Intown I feel there's little improvement
My 5.9 jeep gets about the same as my 400 bronco 12-13 mpg, my cab crown vic is the same as my 5th Ave 15- 16 mpg.
Fuel injection has a slight increase its main advantage is winter time.