t3 .45trim or t3/t4 .57trim

hello guys
im gathering my turbo parts and im now at choosing my turbo.

My plan is to get no more than 200whp and full boost around 3500 up to redline 6500rpm.
I think .45 trim will be boosted bfore 3K , this will then trow tons of fuel everytime and make my MPG go around 20…

On the other side, i think .57trim will get boosted around 4500 , wich leaves me with 2000rpm to have some fun …

Am I right about the numbers? What is the best way to have fun…
chose for me , thks

Another Q, if cruising at 130 km/h at like 3800 rpm and full boost, since the explosion is way better than NA vehicule, do you have to release the throttle position (as opposed to a normal throttle postion with non-turbo car) ? since then it will consume about the same amount of fuel as NA cruising car at 130km/h…

how about a t3/t4 .54 trim a bit quicker spool if not get a t3 60 trim or t3 60 super trim