Summer Versus Winter... www.caranddriver.com

Summer Versus Winter... www.caranddriver.com

Winter gasoline is less... www.verifythis.com

Seasonal Fuel Grade Changes... www.guttmanenergy.com

Summer vs. Winter Gasoline:... m.youtube.com

Why is winter gas cheaper... www.wboy.com

Summer-grade Versus... auto.howstuffworks.com

What to Know About Gasoline... living.acg.aaa.com

summer-gas-prices-2.jpg auto.howstuffworks.com

Date of switch to... www.eia.gov

California Air Resources... www.convenience.org

Gasoline prices rise as... qconline.com

What is the difference... www.guttmanenergy.com

Why is winter gas cheaper... www.wboy.com

Newsom OKs Early Sale of... www.nbcsandiego.com

Gas prices could go down... news.yahoo.com

Indian Oil launches... www.team-bhp.com

Summer blend fuel: What it... thehill.com

Here's why San Diego gas... www.sandiegouniontribune.co...

Winter Grade Fuel | WCF... www.wcfchandlers.com