I remember reading somewhere that is varied a lot. The fasting was one meal a day, the abstinence was less strict. But they suggested that one follow the Benedictine monastic fasting practice is they want a more challenging fast (or the Eastern fasting practice).
You are correct:Here are the guidelines we received at the beginning of Advent;
Very clear instructions, but always options for a more strict fast with the permission of one's Father Confessor: Orthodox churches of the Western Rite adhere to the discipline of fasting and abstinence according to the Latin tradition.
Our Parish follows the prescriptions for this fast as directed in the annual Ordo of the Western Rite Vicariate of the Self-Ruled Antiochian Orthodox Christian Archdiocese of North America.
Fasting & Abstinence in Advent, 2007
FASTING consists in eating but one full meal in a day, and that not before noon. A collation, or about one-fourth of a meal, is allowed in the evening.
ABSTINENCE refers to refraining from flesh meat (pork, beef, chicken, etc.) and the juice or broth
thereof (soup, etc.) Eggs, milk, or its products, or seasoning, are not forbidden in the Latin tradition.
All Orthodox communicants and catechumens in the Western tradition are asked to
follow these rules; however, only those between the ages of 21 and 60 are obligated to
observe the fasts of the Church, and those who have completed their seventh year of
age are bound to the law of abstinence.
In the Western tradition, the Advent fast consists of
Fasting on all Wednesdays in Advent
Fasting and abstinence on all Fridays in Advent
Fasting and abstinence on Ember Wednesday, Ember Friday and Ember
Saturday in Advent.
Fasting and abstinence on the Vigil of the Nativity (24 December)
This year this means that you are to make every effort to
Fast on Wednesday, 5 December
Fast & abstain on Friday, 7 December
Fast on Wednesday, 12 December
Fast & abstain on Friday, 14 December
Fast & abstain on Wednesday, 19 December
Fast & abstain on Friday, 21 December
Fast & abstain on Saturday, 22 December
Fast & abstain on Monday, 24 December
Those who desire to imitate more austere fasting practices, such as those of the Byzantine Rite,
should do so only after consulting with their Father Confessor.