I have noticed many (but not all) Utahns reducing their vowels before a final "l" -- i.e., a tasty home-cooked "mill," Jonah and the "well," etc. Most will deny that they do it -- in their minds they are giving the vowel its full quality but in rapid speech they don't.

I haven't seen this much in Montana though. Probably because the Mormon population drops off quite sharply at the Idaho-Montana border.