Cook 4 slices of bacon in a frying pan. Remove the bacon, and crumble it. Reserve the bacon drippings.
Make croutons: Add the salt and pepper and the salad oil to the drippings and stir well. Add the bread cubes, toss frequently while cooking over medium heat until the bread is golden. If you don't have 4 slices of the bread from the same loaf, just use up any slices you happen to have on hand including hamburger or hot dog buns. Even a bagel can work!
Tear the lettuce into bite sized pieces into a large salad bowl. Cook the 1/2 pound of bacon, save 2 tablespoons of the drippings. Crumble the bacon and then add it plus the bacon from step one to the lettuce. Dice the tomato into small pieces and add to the bowl. Toss everything well.
Make the Dressing: In a large jar with a lid place the mayonnaise, red wine vinegar, 2 tablespoons of bacon drippings, and the chopped basil. Put on the lid and shake well until well combined.
Pour the dressing over the salad and serve immediately.