Hi ,
when I enter Iran in 2015, I didn`t have to pay a deposit at the border.
It was not a problem to drive on Highways in Iran, at the toll stations we didnt pay anything.
At the gas station usually you get gas with 85 oktane, we didn`t get better gas and no unleaded ! gas. you can buy octan booster, which helps a little.
Regards
WolfgangK1
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