How can I improve fuel economy?

[68 TT]

Originally Posted by DreamRyder1963

I have a 625 Demon on my dd C10. I love the carb! It fires up without question, has lots of power, and killer acceleration when the secoundaries are kicked in. I also have a customer that rebuilds old cars and he said that he also loved the demon he put on one of his rides. He is even going to get another one for his 352 powered F100. I have not any benefit in mpg from the carb swap, I have trouble staying out of the secoundaries. I did see some milage gain from changing the worn out fliud in my diff. Don't forget that worn fluid can increase drag in the trans and diff. You might want to think about changing them.

Changing to synthetic gear oil in the rear end while you are at it will make an improvement in efficiency and in power to the wheels too. Not a huge improvement but for the minimal cost difference from dino oil it is worth it. Every little bit helps.

I saw a solid full MPG improvement in my 78 K20 with the change of both diff's to synthetic. Big difference going from 8 mpg to 9.