Pat mentioned in a previous e-mail the use of Walnut Oil, which goes particularly well with champagne vinegar. I highly recommend using it instead of the corn or canola oil listed below (walnut oil can now be found in most large supermarkets).
The amount may be varied to suit individual tastes.
It has 48 calories and 4.6 gms. fat per Tbsp. Since we don't eat vinaigrette straight but add it to some sort of salad, the percentage of calories from fat will go down below 30%% once it is combined with other foods.