What nitro fuel percentage is most commonly used in hobby-grade nitro RC cars?

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The percentage refers to the nitromethane content in the fuel mixture, with 20% being the sweet spot between power and engine longevity for most radio control (Deals) vehicles. Higher percentages like 30% produce more power but run hotter and can reduce engine life. Many racers start with lower percentages while breaking in a new nitro engine.

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