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Car Forum / Ford / Ford Trucks / July 2009higher octane = higher mpg for 2002 V10
Hi again, In a conversation with a truck mechanic, octane came up. My 2002 F53 chassis with a V10 has only been run on 87 octane. He went into a discussion about lower octane firing more suddenly that higher octane fires more slowly but longer in duration but burns more completely. I'm wondering if the electronics of the 2002 V10 engine would adjust to a higher octane resulting in a little better mpg. It wouldn't take very much of mpg improvement to off set the extra 20 cents out of 260 cents. Has anyone, tried or tested the value of using higher octane on this engine? Tim fm CT > Hi again, > In a conversation with a truck mechanic, octane came up. [quoted text clipped - 9 lines] > engine? > Tim fm CT Generally speaking, if the Owners Manual doesn't tell you to use a higher octane, don't. It gives you no benefit. And costs more money. Trust your automotive engineers. (Well, maybe not "Generally Speaking". Maybe "Always"?) HR In article <rowbotth-6A3C07.20571223072009@newsfarm.iad.highwinds-media.com>, > > Hi again, > > In a conversation with a truck mechanic, octane came up. [quoted text clipped - 17 lines] > > HR I did a trial in my 99 (pre three-valve and crank mods) and found no detectable difference between 87 and 89 and 93, other then what I was speeding on gas  Signature-------------------------------------------------------- Personal e-mail is the n7bsn but at amsat.org This posting address is a spam-trap and seldom read RV and Camping FAQ can be found at http://www.ralphandellen.us/rv >Hi again, > In a conversation with a truck mechanic, octane came up. [quoted text clipped - 9 lines] >engine? > Tim fm CT Well, this is not a Ford example, but... My Saab turbo... From the owners manual: "For best fuel economy use regular gas. For best performance use preimum". Now, I could give f* all about economy, after all I drive that Saab about 500 miles a year, so I use premium, but were I to consider maximizing my economy I'd sure try regular. Now, closer to your Ford, my Dodge Hemi says Premium (only). I'm cheap with that truck (gets many more miles) and usually fill with regular. I've not noticed a change in economy in it (if there is, it is nominal) but performance is not as good as with premium. >>Hi again, >> In a conversation with a truck mechanic, octane came up. [quoted text clipped - 23 lines] > I've not noticed a change in economy in it (if there is, it is > nominal) but performance is not as good as with premium. Your Saab Turbo _wants_ premium fuel, but can adjust itself for regular fuel if you don't mind the performance degradation. Instead of 0 to 60 in 4.5 seconds on premium, it takes 6 seconds on regular. Most people would never know the difference if that's all it is. >>>Hi again, >>> In a conversation with a truck mechanic, octane came up. [quoted text clipped - 28 lines] >seconds on premium, it takes 6 seconds on regular. Most people would never >know the difference if that's all it is. <BG> > Hi again, > In a conversation with a truck mechanic, octane came up. [quoted text clipped - 9 lines] > engine? > Tim fm CT If your engine calls for 91 octane, and you've been putting in 87 or 89, then the engine will adjust itself for the lower octrane. If it calls for 87, you will get no benefit from from using 91. Well, your wallet won't be as heavy as you have grown accustomed to, and that might be a benefit of sorts. >> Hi again, >> In a conversation with a truck mechanic, octane came up. [quoted text clipped - 17 lines] > >>> Not really, Its not this cut and dry. If it calls for 91 , Its probably a performance car like a VW, Saab or Corvette or other. And the engine timing may not be adjuistable down to 87 or 89, or adjust to a lower octane as it might be a bumped compression ratio requiring the octane. This is why they say , use 91 only. If it can adjust down then you can use 87. If the car has variable timing for octane then a higher octane should allow higher mpg/ power if the timing adjust for it . If it doesnt adjust then the higher octane might be wasted. Might , because higher octane gas is slightly less volatile then a lower octane with less additives to raise the octane in the first place. In the case of some gas stastions. They just mix their tank of 91 with the tank of 87 in the pump . To pump 89 in your car. However if the car has a minor problem like a worn egr washer, running hot, or a slightly advanced timing. Or just needs a tune up. It might run better on the higher octane. stop pinging, or get better mpg. |
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