Doesn't WVO void the Elsbett warranty? Ithought it had to be Canola SVO? Vegetable Oil has less BTU's than diesel so you will get a reduction in MPG when running Vegetable oil over diesel. Your performance increase is probably due to all the "maintenance" that you have done to the car, rather than the use of WVO. Are you running stock tires? Have you checked your tire pressure? Alignment?

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2005 SL65
1999 E300
1995 E300
1994 SL320
1988 560SL
1987 300TD
1982 300D
1955 300SL