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i dont think the cam will help with mileage. ive heard the A6 cam is the best (smallest?) for mileage.
as for the compression ive heard the same as you have, that higher compression will help. only real way to tell with your individual vehicle is to do it and see what happens. do as much recording of your current mileage as you can and either do the head gasket or rebuild the entire thing. you can get all different thickness head gaskets and you can plug the numbers into a d series compression calculator. i did a d15b7 with a z6 head gasket and shaved the head and came up with about 10:1 compression. i couldnt do a comparison because i got the car with a bad gasket. but i averaged 42-43 normal driving and highest tank i ever got was 50 mpg while EOC. i was using regular fuel too. i was happy with it. but now im doing a d15z1 swap
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