Quote:
Originally Posted by BandG
......cut.....
So I wonder what dramatic changes they made since 2017 to make these recommendations?
I have only used 87 octane up to this point. If I ever climb the Rockies towing my Jeep, I'll probably drop a little more for the 91 octane, but unitl then, I've been fine on 87 octane.
|
Only F53 change I’m aware of is when Ford derated power from 362 to 320 HP, but don’t recall exact Model Year. It would have been in that time frame or a little before. I’m not sure what they changed, but could have affected their reasoning regarding octane recommendations. Torque went up a tiny bit (3 lb-ft) so who knows what was involved.
Someone mentioned compression ratio, but that’s only a small part of overall design. Some new engines with direct injection run 12:1 on regular gas, although they are way more advanced than the Ford V10. By modern standards 9.0 and 9.2 CR is low even for heavy duty trucks.
By the way, I’ve driven various V10s in Rockies using regular 85 Octane and didn’t have any issues. The only thing I do is avoid lugging an engine, which I always do no matter what. Even if it cost a little MPG, I’d rather let the engine spin at higher RPMs and lower torque. It’s an old habit I learned driving trucks with stick shifts.
Thor Forums
