What are Carolyn Scott's top eco-friendly car ownership tips?

Here are my top eco-friendly car ownership tips:

• Use biodegradable car-wash soap so runoff does not harm waterways or wildlife.
• Choose and maintain eco-friendly, low rolling resistance tires and keep them properly inflated.
• Recycle gas, oil, and antifreeze at approved facilities so they do not contaminate soil or water.
• Stay on top of repairs and tune-ups; a well-running engine and transmission burn less fuel.
• Limit driving when possible by walking, biking, or using public transit.

Would you like ideas for making your daily commute greener too?