should i adjust the speedo/odometer with my new setup

Hi there guys well i have a jetta mk6 2013 TDI, stock size is 205/55/16, after a year using 225/45/17 i changed again the setup due the bad roads in my city. Got tired to replace tires and fix bend wheels.

Now i have the wheels from te new beetle sport bridgestone turanza er300 215/55/17 tires. The car feels amazing. I track my mpg on fuelly so i guess due the wrong odometer reading my gas reading will be off.

Btw my last mpg was 36 now 31 according to fuelly thats why i think i need yo adjust my odo

http://www.tacomaworld.com/forum/tirecalc.php?tires=205-55r16-215-55r17

You're reading ~5.5 % slow. It's up to you if you wan to change it. If it was running fast, then sure as you'll end up killing your warranty quicker. If you don't change it, just remember to change your oil/maintenance every 9500 miles, not 10k.

Well did 20k service today, here is some pics with the car clean:

btw, did the coding after call ross-tech for help, so right now everything is set:


Stock coding:


New: