With $4 gas, what do you get for mileage??????

my dad is driving my 78 volare 225 3spd man = 27mpg
my moms 64 valiant 225 auto=23-24mpg
my 86 ranger 2.3 5 speed = 28-30mpg
my wifes 03 excursion 7.3 auto=15-18mpg