Is denatured alcohol safe to put in the gas tank of a vehicle?

No Never, you must use Fuel 90, 92 or 95 (and Higher), but some Cars needs Diesel Like Hyundai H1.

Warning!:: If you used Fuel 80 your Car will be completly destroyed and it won't go to up to 120 KM/H.

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Note:: Better Feul (95 or 98 etc...) Costs more money I use 92.