Slant Six mpg's?

73 Dart, if you don't have the tools you'll need a vacuum gauge and an engine analyzer kit that comes with compression tester and timing light. All together it should run you about $75. There are old Craftsman engine analyzer kits on ebay for cheap. After that we can direct you on how to go about tuning your car. The tools will pay for themselves in a month on the gas you'll save.