tips for better MPG

[1972BlueC20]

I know these trucks are not bought for their fuel efficiency, but I'm getting between 7-9 mpg per tank. My truck needs a new sending unit, so Im having to watch the miles instead of gas gauge. I got 109 miles down with 14.3 gallons burnt LOL

Any tips on getting a little better MPG out of this thing?

I've recently done a full tune-up, converted to electronic ignition, got the timing right, changed the oil, air filter, PCV value, tire pressure is good....any other things I can do?

Again, I don't really care about the gas mileage, this is not why we drive these beasts but if I can save some extra $$$ that's more that I can dump back into her!