in my opinon,if the tires r ok,that is >3mm. and less than 4-8 years, u can still use them. i always use 2 new tires in front for 3-4 years(still >3mm),then use them in rear for next 3-4 years. so i can always use new tires in front.the front tires r more important than the rear ones.
i do not think u have to prepare the gas. just fill ur car up when u see any gas station. do not worry about that. i went to central mountains many times.tw is small. even when drive around USA for 72 days. good luck
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