Google earth directions or maps?

Ok. i have an old 74 chevy whos gas gauge don't work. until i do i need to have a way to see how far distances are. i ran out of gas in one spot and put two gallons in (with small gas can at that spot) and i know exactly where i drove so i would know how far i went on two gallons. so then i can plan where i go when to get gas. but i have done the directions on google earth and remember being able to change the routes but i can't. i don't need to use google earth maybe other online resources. i just want to know a directions type deal that will give me distance allowing me to change the route myself.Google earth directions or maps?
http://mapquest.com

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