DODGE RAM FORUM - Ram Forums & Owners Club! - Ram Truck Forum - View Single Post - Fuel economy vs gas octane
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Old 12-11-2009, 12:46 AM
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Join Date: Sep 2009
Location: Cushing, OK
Age: 35
Posts: 1,023
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Vehicle: 2009 Ram 1500
Trim Level: ST 2X4
Color: Bright Silver Metalic
Engine: 2008-20?? 287ci (4.7L) PowerTech V8 310hp 330lb/ft
Rep Power: 8
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The octane number you see on the gas pump is an indicator is preignition resistant. That's it. Is has nothing to do with fuel economy. In fact higher octane fuel has more addatives to affect that property and theoretically results in lower enegry desity and fuel economy. In practice the difference is unnoticably small and there is no change in MPG based on gas octane.

Mods: Thule Xsporter 422XT bed rack, Underrail Rhinolining, MOPAR class IV Hitch, DIY CAI, Aero Turbine 3030.
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