Confusion help required to buy or not "The Giant"

Can anybody pls help me out..jst test drove the 2.2 model n am planning to purchse it..but my usage is very very less say jst abta maximum of 100kms per week or even less than that so shld i go for this deisel beast or not.??

Heart no doubt skips a beat for it but mind is not coordinating with it n there the confusions r sitting..tata's SERVICE..car's MAINTENANCE(hav listened deisel cars hav huge maintenance cost) so kindly help in.......