Fact or Fiction

[Sean]

Using a higher grade fuel (92) when towing/hauling a load is better than the normal 87octane for everyday driving. A friend was trying to tell me that the higher octane helps the motor work less when pulling hills.

I can see how this mite help in older trucks but with the modern trucks i think it would be money wasted.

Your thoughts?

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[Brian_Goleta]

My 04 siverado with a 6.0 seems to work better with 92 when towing. I always run 91/92 when towing.

[Martin]

From what I've heard from my friend who is heavy line Ford mechanic he said buying 91 is a waste of your money all gas engines are built to run on 87 octane.

[sickrick]

Almost all motors in modern USA cars run great on 87 octane.

Towing is a circumstance that higher octane may give better results.
On new modern engines the timing is automatically adjusted to help with milage performance ect. When towing or up hills (lugging the engine) there maybe times that the engine will ping (pre-detonate) and cause the knock sensor to retard the timing; this may not happen as easily with higher octane.

Vehicles with a manual trans will notice this more as the auto trans tends to shift before you are lugging the engine to hard.

I doubt that the higher price of the gas is worth the slight difference for the few circumstances it may be benificial.

I know lots of people who only use premium because a mechanic or family member told them it was better; what a waste of money driving your 94 taurus on 93 octane!