Every year it's my tradition to look at all my fuel and mileage data for my car for the year. Sadly, this year, I turned in my 93 Tercel, and purchased a slightly used Yaris. I was curious all year about the difference in performance, since they basically have the same engine, but the Yaris has a few more electronics under the hood. Well, the proof is in the chart below, and the cold hard data:
Tercel, multiple years' data = 6.99 L/100km
Yaris, 7 months' data = 6.85 L/100 km
So, I guess maybe technology does make a difference.