I live @ 4,400' altitude, hunt and off road up to 10,000', My truck daily driving is a pig at light to part throttle, it bogs badly. I am a mechanic by trade as well as a shop owner (37 years) have raced cars, boats etc.. I have modified hundreds upon hundreds of vehicles, boats, etc..
I know these computers adapt well for altitudes, but they still have like 5 maps ( example ) that the tuner has wrote advance curve / fuel curves into. I guarantee my truck needs more timing. I currently am running the 5 star Daily Driver 87 tune & bumped up the Global Spark 2 degrees to a 89 octane tune. It definitely is still a pig, their 91 performance tune is a bunch peppier but the shifting winds too long @ part throttle and constantly downshifts.
I'll bet I could run a 91 tune on 89 with no ping at all due to my base altitude. I also smell my cats at different throttles almost daily at least once, and I don't like it. As I don't want to fry my cats and eventually I feel it will. I need a real "custom" tune not a canned tune for the masses, I understand the vast majority live mostly @ sea level to 1,000' but to me its not a custom tune just because you / they have a tweak for my Intake and exhaust. Altitude rule of thumb has always been advance 1 degree per every 1,000' feet with a wot value of 40 to 42 total (in older stuff) I haven't messed with mapping in quite awhile and shit has changed a bunch since.
I would like to know
#1 "the tune's" timing / fuel maps, obviously they are tweaking them
#2 how many maps are there that the computer can switch to
# 3 Someone has worked with SVC already on bumping just the timing above your normal tune ( I have discussed both 5 star and your tune with him, I'm leaving out his name) you tweaked him a very custom tune with more advance on top of 0 tune and he is very happy.
#4 Will my SCT Livewire perform a data log for you or do I have to use a laptop and a special program?
I'm not spending any more money on tunes till I know my shit is going to run peppy without dropping my fuel mileage. Typically a bit more timing (when needed) adds to your fuel mileage not subtracts from it.