I have found this equation provides a good target sixty foot for many door cars, normally aspirated. Some cars are a little better, but if yours is much worse then something isn't optimized well (converter, gear, tire, etc).

sixty = 0.12xET + 0.17

For example:

1.63 @ bremerton 12.40's: Eq gives 0.12x12.40 + 0.17 = 1.66

1.70 @ vegas 12.80's Eq gives 0.12x12.80 + 0.17 = 1.71