im now over 80k miles.. my vx is growing up so fast!

heres my question.. my last 40k have been run with mobil1 full synthetic almost exclusively.. (5w30 and 10w30 depending on season/availability) but now im wondering if it would be better to switch to high mileage formulas or to just stick with regular synthetic.. i havent seen a high mileage specific synthetic.. anyone make one of them?

and i always run a mobil1 filter (except this last change, i got a K&N oil filter at a great price)