V10 Higher Octane?

[RAllison]

I have a 2002 F350 V10 with 235000 miles on it, and I have always tried to run the higher octane gas. Just wondering if that was a waste of money? Thanks Rich

[ktmrfs]

smkettner wrote:
If it calls for 87 that is what it needs in all conditions.
Higher elevations you can probably even go lower, I don't.

above about 3500ft you'll find that pump octanes are 85, 87, 89 for regular, mid and premium instead of 87, 89, 91 needs go down even more above that altitude.

Unless the manual calls for something other than 87 octane your not going to gain anything. engine ecu isn't going to give more advance,

[time2roll]

If it calls for 87 that is what it needs in all conditions.
Higher elevations you can probably even go lower, I don't.

[msgtord]

TUCQUALA wrote:
I don't consider it a waste, esp towing in the mountains and hot weather. Higher octane will help prevent detonation under those conditions. Then the computer won't back the timing off as much or any. Most of the time, I don't use premium, but will if towing heavy in hot weather.

Same here.

[TUCQUALA]

I don't consider it a waste, esp towing in the mountains and hot weather. Higher octane will help prevent detonation under those conditions. Then the computer won't back the timing off as much or any. Most of the time, I don't use premium, but will if towing heavy in hot weather.

[azdryheat]

If it doesn't ping on regular then there's no need for higher octane.

[samsontdog]

I have a 2003 F250 with the V10 and it runs great without the higher octane

[jerem0621]

Yes it is a waste. No need to run higher octane fuel that it was designed for. Ran regular in my V10, 5.4, and my current 4.6.

Thanks!

Jeremiah