Advice/Questions on Buying This DODGE RAM 1500 For my first car(Pictures)?

http://www.youmanschevrolet.com/profile.asp?VIN=3B7HC13Z5YG150011&xMake=&FilterMake=0

1. How much would gas be to fill it up, (its 4 dollars a gallon here)
2. Is it dependable, with the 150,000 miles it has on it, wil it last another 100,000 Miles?
3.How Dependable are dodge rams?
4.Should i buy it
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