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The choice of gasoline for your 2019 Jeep Wrangler will depend on the type of engine in your vehicle. The 2.0 L engine requires premium unleaded gasoline with an octane rating of 91 for optimal engine performance, although you can use regular unleaded as well. On the other hand, the 3.6 L engine is best suited for regular unleaded gasoline with an octane rating of 87. While you could also use premium unleaded, the difference in performance is negligible. My suggestion would be to opt for regular gasoline to save some money.
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Jeep suggests using a minimum of 87 octane regular unleaded fuel for the 2019 Wrangler.
My 3.6-liter Penstar engine performs well with regular 87 octane fuel, but it runs exceptionally well with 91 octane. The fuel efficiency increases with the higher-quality fuel. That's just my opinion. It prefers Shell and Chevron fuels the most.
2.0 turbo: When using 91 octane fuel, the 2.0 turbo engine is recommended for optimal performance. For the 2.4 and 3.6 engines, 87 octane fuel is suitable.