better mpg..or myth

Discussion in 'Engine, Fuel and Exhaust' started by gunnut, Feb 24, 2011.

  1. gunnut

    gunnut Junior Member

    Is there any truth in the rumour that you get more mpg dependanding on what fuel you use??I've heard cheaper fuels have less additives desto less mpg.What say you all???
    I think I got better mpg from Esso,as apposed to the local supermarket cut price fuel,on the other hand,maybe it was just wishfull thinking.
  2. brownfoxx1

    brownfoxx1 Active Member

    higher octane= better performance & mileage. in my view.water in the fuel storeage tanks really affected some drivers mileage. try & stick with a newly opened gas station. less chance its tanks have water in
  3. fin_676

    fin_676 Experienced Member Staff Member Moderator Contributor

    Petrol all comes from the same refinery here in scotland it might even be deliverd by the same tanker visiting the esso first then to tesco the difference is that any additives that make the fuel different are added when it is going into the tanks at the petrol station
    petrol station owner says they dont add anything at tesco i tend to get a few miles more to the gallon in my car using esso

  4. dbmg

    dbmg Guest

    There is the possibility of more fuel mileage from one brand versus another. The biggest indicator is how hard the right wrist is used while riding and the mods done for more power.
    I go with myth.
  5. Iceman24

    Iceman24 Well-Known Member

    The worry isn't worth the cost...if you run 91 - 93 octane - bike will be happy...
  6. Jack Klarich

    Jack Klarich Guest

    IMO, the sooner you get into high gear with out lugging the engine and then roll on the throttle easy you will get your best MPG no matter what gas you are using
  7. JDPEagle

    JDPEagle Active Member

    Complete Myth.... ditch the ethanol and you'll get better mileage and a longer running bike. Thanks EPA.

    This is also a myth (although the oil companies would want you to think otherwise). The octane rating simply indicates the pressure the fuel can withstand before spontaneously igniting. For better "performance," one should always use the lowest octane possible which results in no "knocking" (or fuel ignition without a spark). The lower the octane rating, the lower the pressure the fuel can withstand without igniting. Higher performing engines often run at higher compression ratios thereby making a higher octane necessary; however, the fuel is not the source of the performance... the engine is.

    All that being said; follow your owner's manual.
  8. nakkers

    nakkers Junior Member

    Having a sporty with no fuel gauge, I have to watch my mileage closely or risk walking. I've experimented with octane and brand. The owner's manual calls for 87 octane (low grade) with up to 10 % ethy.

    I found mid grade, 89 octane gave the best "feel" and mileage. I couldn't measure any meaningful advantage of premium fuel (91 octane)

    This is for Canada.

    I did have some fuel problems from an independant station so, I keep to national brands and generally don't seek out one over the other. Just happens Shell is right around the corner so, they get the majority of my business.

    Not sure if that helps or not considering I'm not on a big twin like most of you.

  9. bc45

    bc45 Active Member

    My understanding is the octane rate on the pump is a combined rateing of research # (RON) and (MON) Ron is determined with test engine at 600rpm standard Baro intake temp @125 ron is primarly adresses part throttle knock or ping, Mon adresses WOT engine @ 900 rpm stabdard Baro intake air temp up to 300deg. The rateing @ pump is AKI (anti knock index) wich is MON + RON. Octane is the blend to handle higher temp and pressure(compression)
    Burn rate is determined by other factors that the fuels are formulated for.

    Sunco Maximal race fuel formulated for pro stock devision has a octane of 116 and is there fastes burning fuel. these engines are turning at 9,000rpm. and need a fast burning fuel to get complete combustoin.

    A higher or lower octane # dose not in itself determine if it is a fast or slow burning fuel, It also dose not give a direct indication of power out put since octane is not oxygen or carbon wich you would need to add to increse BTU output of the fuel you are burning.

    I am not a expert just some things I have learned in 30 years in the auto industry.
  10. bc45

    bc45 Active Member

    I agree I would never use or rec the use of that high of octane for steet vehicle. Of the 5 race fuels that Sunoco makes the one that has the highest octane rateing has the fastes burn rate of the 5. I was using it as the example because it was the only brand of fuel that I could fined published figures for octane and burn rate. I have heard the statement that high octane burns slower but have never seen data to confirm that. Not saying it is not out there.
    I would consider Burn rate of fuel the measurment of time required for complete combustion.