Is 0W-30 recommended for your car? The Probe says 5W30 or 10W-30, so 0 seems a bit thin.
Anyway, congrats on 105mpg- that's over twice my best tank. Get those serial numbers on!
Also, you're in good company.
(Ford Anglia 105E, Mazda Carol, Citroen Ami 6, Packard Predictor concept)