Try Trip Chaining

Trip Chaining means linking driving trips together to reduce the number of "cold-starts" -- starting your car after it has been siting long enough for the engine to cool.

When you start your car after it's been sitting for more than an hour, it pollutes about five times more than when the engine is warm1. That's why combining your errands into one trip means more time in your life, less traffic congestion, and less pollution…which all adds up to cleaner air.

So make a list, plan your route, and trip chain. You'll be saving a lot more than just time.