Will a blaster coil Improve gas mileage?

I just recently bought a 84 Chevy blazer and I know they are not the greatest on fuel economy, and i was wondering what i could do physically to it to improve the gas consumption. my friend was telling me about something called a blaster coil does it make any difference? along with spark plugs, air filter, tire pressure, and taking out any unnecessary weight what are some other ways besides driving technique can i do to improve my gas mileage?