My wife and I recently had a conversion where I said "...but that was a few years ago now."
My meaning was it was 10-15 years ago, but wife translated as about 3 years ago, which led to a lot of confusion! (Since a few normally means around 3).
I can't find anywhere that suggests adding the "now" implies a longer time, but certainly when I read "a few years ago now." I'm thinking its a longer time than "just a few".
Note: I'm British and have lived in the US. I'd suspect this is more British than American. My wife's English is excellent, though not a native speaker.