The version with "at" would seem to be less, not more, formal. This is how folks from the country talk sometimes. They tend to throw in extra words, for effect.
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MeggPhaggSiouxSo, "The car was going at 60 miles per hour." is wrong.No. I don't have any problem with either version.
MeggPhaggSiouxSo, "The car was going at 60 miles per hour." is wrong.No. In fact you can dress it up even more:
MeggPhaggSioux"The car was going 60 miles per hour." "The car was going at 60 miles per hour."Both are fine.