[IYAS9YAS]

I doubt she can save enough gas to be "worth it" to ride her bike part way. I don't know how far she is riding, but the last few minutes of a drive are when the car gets the best gas mileage, as it is warmed up. The first 10 minutes are generally worse for gas mileage.

Well, then, she should ride her bike the first ten miles and commute from there. Then she'd get that advantage of efficiency (kinda like daylight savings). ;-P

[CharlesWayneCT]

I bike to work occasionally. I live 3 miles from work, so it’s pretty easy. On the other hand, I get 45 mpg, so my 6-mile bike ride only saves me about 40 cents. And it costs me about 20 minutes (I have an electric motor on my bike so if I want I can move pretty quickly).

Most days it just isn’t worth it to me to save a few pennies. Sometimes I ride because I enjoy it. The older I get, the less I enjoy it. :-)