Mr= Mider or mister?
The T will often become a D after an R or between vowels, which are voiced, although not if it comes at the end of the word.
Congradulations. Petals (on flowers) will sound like pedals (on a bicycle).
Mister - the T comes after an unvoiced S. (You also left out the S in your suggested pronunciation.)
Yankeesounding more like the word 'chew'.
Also, I do:
twenny, thirdy, fordy, fifty, sixty, sevendy, aidy, ninedy
CJ