I know there are a lot of guys who will disagree but I have had a great deal of success using Brodaks 10/23 in my Fox 40.  I bought it new from Fox about four years ago and mounted it in my scratch built Big Tiger, a Claus Miklas design and I have absolutely no regrets.  It's the only plane I've ever had it in and the performance has been wonderful.  When I first ran it I was using the Brodak 10/29 for probably the first 36 flights or so then I changed to use the 10/23 because I wanted to reduce the oil residue on the plane and cooked on the head.  Again, I've been very pleased with the Brodak fuel.

Jim Carter