75/76 Dodge Dart /6 average MPG and improvements

Hey all. New to the forum here and not sure if this is really the right place to post this, but Im sure Il find out soon enough. Here goes...

Im looking to pick up 75/76 model Dart with a 226 in it for the fact that I cant really afford a vehicle I can only drive on weekends, but, you know, got bit by the classic car bug. With gas prices in my area reaching as much as $1.10 per Litre (thats about 0.40ish gallons) gas costs are a major concern, in addition to my lack of extra parking and need for a regular driver that Ive picked this car as the one Id like to buy.

Now Ive read a few threads about this before, but I was hoping to get some more concise information on the fuel economy of these cars, and ways one might improve that. Quite frankly, new to cars in general so I can use all the advise I can get.

Thanks in advance. Your all awesome. :D