[Mgs] Petrol

[dcouncill]

    A few points to mention here from Han's post -
    The octane rating in North America is calculated
      differently than Europe where the North American values are
      typically about 6 points lower. so Han's 98 is around 92 here in
      the USA. Depending on local petrol stations, I use 91 or 92
      premium. Octane requirements vary due to elevation so in higher
      elevation (mountainous) regions of the USA, premium is typically
      89.
    
    
    Ethanol is a lower btu value fuel so mpg will be
      less. Ethanol has about 30% less energy. During my high mileage
      driving days using gasohol, I saw about a 1 mpg reduction, a little more than
      what the math would indicate.
    
    
    A response to Max -
    I agree about ethanol. I have been using E10 in my
      cars almost exclusively for the last two decades. I did have a
      premature failure of the gas hose between the SU carbs in my 67BGT
      about 15 years ago that was likely caused by the gas formulation.
      More recently, I replaced the fuel sender in my 64B and the
      plastic float absorbed fuel within a few weeks, also likely due to
      ethanol. However, Moss sells the original style brass float as a
      replacement. Those have been my only issues. New rubber components
      are likely to be ethanol resistant.
    
    
    
    The main issue with E10 is that it absorbs moisture
      and in time can undergo phase separation where water can
      accumulate in the fuel tank. However, that involves being in a
      humid climate and significant time to allow the alcohol to absorb
      the moisture to its saturation point and then having the alcohol
      evaporate, leaving behind the water. If you drive your car
      frequently and routinely gas up or do not live in a coastal or
      lake area, there should be no problems with gasohol.
    
    
    There is a premium cost for straight premium gas -
      in Idaho it is about 30 cents a gallon more expensive and can be
      hard to find. But I have found it readily available in boating
      communities.
    
    
    Another point -
    Gasoline does not absorb water as readily as gasohol. If you live
      in very cold climates where condensation is
      common, water can and will settle in your tank. When I lived in
      the extremely cold climate of Montana in the 80s when gasohol was
      not available, I experienced gas line freeze ups. We had to keep
      our tanks full to avoid humid air and had to add gas-line antifreeze ("Heet" aka methanol, 12 oz per tank) to avoid this. With
      gasohol, that is no longer an issue.
    David Councill 64B 67BGT 72B
  
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