Is there a rule of thumb for jet changes when running at much higher altitudes. For example, We had a pretty good tune at around 2600' DA and are going up to somewhere around 4000 to 4700 DA. Was thinking around 2 ot 3 jet sizes?

in the past i have taken my car from georgia 34-3600ft to Atco NJ. which is sealevel..sometimes -500ft
fwiw..i needed 2 jet sizes larger at see level..but i also know it will depend on the jet. look at its corresponding drill size....
.some times a change/drop in a single jet # reflects a multiple# drop in drill size or more..

Jet Size Drill Size
70 .0735”
71 .0750”
72 .0755”
73 .0790”
74 .0800”
75 .0820”
76 .0840”
77 .0855”
78 .0870”
79 .0890”
80 .0890”
81 .0920”
82 .0940”
83 .0975”
84 .0985”
85 .0985”
86 .1000”
87 .1015”
88 .1025”
89 .1045”
90 .1055”
91 .1085”
92 .1100”
93 .1125”
94 .1155”
95 .1165”
96 .1195”
97 .1210”
98 .1240"