SLANT 6 a GAS GUZZLER?

my 68 /6 has 103,000 actual miles and gets 20.7mpg on short trips/intown driving..dont never go to far,so not sure what the hiway mileage would be..

And an american gallon is smaller than an imperial gallon...so you are doing even better than us..our car has 44K miles..wonder what we are doing wrong....