i think this patch "fixes" the optimizer by removing a routine that makes compression work more often, but it still has a benefit. the optimizer, right now, should only patch out the automatic transmission tables if the automatic transmission flag is not set, and the maf tables if the speed density flag is set.. since this is write-time, as long as you're the kind of person that keeps track of their bins locally, you should never know it's happening. it skips some 0xFF bytes if they show up at opportune times, though, so very small speed-up on auto/maf bins too.

i can't seem to reproduce where the automatic transmission bin had its shift tables filled with 0xFF, are you sure that's not a manual trans bin? might have been simply corrupt due to the optimizer being broken.