Alex F
Well-Known Member
- Nov 14, 2006
- 9,166
- Boat Info
- 2005 420DB with AB 11 DLX Tender, Raymarine Electronics (2x12" MFDs) with Vesper AIS
- Engines
- Cummins 450Cs, 9KW Onan Generator, 40HP Yamaha for tender.
This is wrong, wrong, wrong. Using higher octane rating WILL NOT do *ANYTHING* to improve mileage or efficiency of burn unless the engine REQUIRES it. Although results may mislead you if you're dealing wiht an engine that's out of tune or inefficient to begin with.
You're completely wasting your money if you think putting premium will somehow "be better" for an engine that doesn't require it. Now, there may be some factors like additives (detergents and such) that may be found in given brand's premium blend that's not in the loca cheap place's regular. But even that's unlikely given today's fuel formulations.
It's just as true that changing your oil more frequently will do more to prolong the life of the engine than spending excessively on fancier oils. It had more to do with the changing of the filter than anything else.
If it makes you feel better to believe the myths, then fine, but don't go spreading that nonsense to others. It just isn't true.
wkearney99,
First of all, I just expressed my opinion, just like you're. Second, you say that I'm wrong, but provided very general statement with no specific facts.
I don't have any labwork scientific writeups or facts as well, but I go by basic facts, which are:
1. Manual for my SUVs state that premium is recommended for better performance and fuel economy.
2. I had simply tested the theory on several occasions and all can say that I loose about 70-100 miles per tank when filling with 87 vs 91 (mix driving city/hwy). This simply means the vehicle lost performance as well as the fuel economy. Without analyzing any science behind it this is a simple fact I've observed first hand. So far this backs up what the manufactory recommends.
3. Going back about 10 years, I drove cars that performed exactly the same. Going back 20 years, some cars wouldn't even drive on 87.
Again, I just shared my experiance and opinion. If you have different experiance and specific facts I'd love to learn them and see what tons of people, including myself, are missing. But in the end, despite all the facts and arguments, I would still have only one question "why does a car/suv looses in the mileage when filled with lower octane gas?".
Thx,
Alex.