I have just put a 2.94 gear set in my 68 dart convertible with the 225 slant six. I just had 2.76's in it last summer. Now I also changed some ignition stuff and only had the car out once so far due to all this rain. But on high ways and hills (which is what I drive to work) I really didnt "feel" any major difference when it came to performance. No idea about fuel mileage, but I am sure it would be similar enough that I dont care about the change.
