You might want to check this site out before you travel.
It list the cheapest fuel prices in the area.
http://autos.msn.com/everyday/gassta...?zip=&src=Netx
just add a zip code or most city names.
I found that in route to Norwalk that in just 40 miles of me I can save $ 0.40 a gallon x100gal adds up quick.
Hope this helps.