73 Dart /6 MPG

slantsixdan said

Spec (TDC) is good for creating mushy acceleration and poor mileage. Try 5°BTDC with the engine idling at 600 rpm and the vacuum advance hose disconnected from the distributor and (hose) plugged. Then reconnect the vacuum advance hose and readjust your engine idle speed to 750 rpm, making sure both the idle speed and mixture are set correctly per this post.

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I have a 73 Dart with a 71 slant six, bone stock, no emissions crap, ign timing set at 10, 2.76 gears, auto, and 205/75/14 tires. Just got back a few weeks ago from a 38 day, 8,035 mile road trip. Car loaded down with parts, tools, luggage. Lots of cold starts. Some heavy city driving (Chicago, St Louis, Albuquerque, and a 5 1/2 hour stop light to stop light grind through LA. A lot of back roads and light city driving ( I did route 66 ), over mountains and through snow (on the return trip), and some higher than normal highway speeds, for someone from the North East anyway (70 mph). Used just over 400 gallons for an mpg average of 19.8 mpg. Agree with other poster that 70 mph vs 55 uses more fuel. Also Nebraska corn bred gas may be cheaper but also causes mpg drop.