Here are some helpful links that will help you achieve our stated goals:

The AAA (American Automobile Association) has always been a leader in efficient transportation.  Some words of wisdom from them:
https://exchange.aaa.com/safety/driving-advice/conserving-fuel/#.XOqHU-hKibg

CARBIBLES offers some of its own tips:
https://www.carbibles.com/improve-gas-mileage/

Greener Ideal also has tips for keeping your shopping green:
https://greenerideal.com/guides/0327-10-eco-friendly-shopping-tips/