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Engine & DrivetrainDiscussions about the engine and drivetrain of your vehicle.
This is a discussion thread titled "what grade fuel is best for 4.7?", within the Engine & Drivetrain forum, part of the Technical & Vehicle Assistance Forums category.
Well I have friends who use regular unleaded with no adverse affects. I personally use Supreme exclusively as I can afford to and I have since day one. I also have some friends who say if they use anything but high octane their motors start to ping at speed. I take no chances on my $30,000 truck though.
I used to use 89, but prices went up so i switched to 87 with no noticable difference.
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A year or two back, "Car & Driver" magazine tested several cars on the dyno with gasoline of different octane grades. All these cars had modern computer controls on the engine. Octane higher than recommended made no difference. The test runs with the recommended octane grade and a higher grade produced dyno numbers equal within the error range of the machine. For engines that required high octane gas, low octane gas produced lower hp numbers and equally lower fuel economy that just about equally offset the cost savings of the lower priced gas.
87 octane of any good brand with a good detergent additive package is just right for the 4.7L I-Force.
Ken
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The only time I put 91 octane in the Tundra is when I'm going to tow my car trailer. I didn't really keep track of the MPG but I figured it would allow the engine to work harder since the 91 has more energy than 87.
Originally posted by Stevie Ray The only time I put 91 octane in the Tundra is when I'm going to tow my car trailer. I didn't really keep track of the MPG but I figured it would allow the engine to work harder since the 91 has more energy than 87.
No, 91 octane does not have more energy than 87 octane. Actually, the 87 octane contains more BTUs of energy than the 91 octane. Octane is a measurement of the fuels ability to resist detonation (knock, ping, etc.), not its energy content.
This resistance to detonation of higher octane fules can be used to your advantage if your engine is designed for it (high compression, forced induction, aggressive ignition timing, etc.), which the Tundra engine is not. The Tundra 4.7L engine was designed for 87 octane fuel (at sea level).
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what grade fuel is best for 4.7?
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