Ignition advance

Dear friends of this forum, I have a new topic this time is a friend who transmits this concern.
It has a wolkswagen goal 1.6 lts. 2008 model, its city consumption is 7.5 to 8 km per liter, it was finding out and other similar cars make more than 11 km per liter.
Someone told him that being a Brazilian car, there they use fuel with methanol, so the injection advance is 9th, in Argentina because of the fuel used, it has to give it an advance of 14.2º and that would modify its consumption, if there is someone who can help me with this issue I will thank you.

Hello friend, the advance is 9º and that is not modified here in Argentina, the fuel is 95 octane and is sufficient for that model, check the tuning of the distribution to see if you do not have any running tooth, tell us as you go, greetings.

The advance of the ignition is directly related to the speed of propagation of the flame, which in addition to the quality of the fuel depends on the composition of the air-fuel mixture, and a no less important factor such as engine wear.
For all this, the adjustment of the advance of the ignition is not a static issue, when the engineers determined that the appropriate value for that engine is 9º, they did it with an engine in optimal motor conditions, ignition and carburation, which vary.
Therefore the best parameter to determine the ideal point of the ignition for an engine in use is to use a vacuometness and set the advance in the position in which the highest vacuum value is generated, this allows somehow to compensate for the variations due to wear.

Nizome, in this case it is a 2008 model car that has only 12,000 km, its owner uses it little precisely due to the high consumption it has and in the official agencies they have not known how to give it an answer, the problem must be elsewhere, I do not know if the injection system can have some failure, my knowledge of mechanics in that area are void, for my age, most of my life has touched me to work with carburetor engines.