1998 E300 TD w/129k Averaged 30 mpg for the last 10k miles. Changed the fuel lines to 10mm plastic and viton, added coolant heat exchanger to heat fuel and mileage dropped to 21 mpg. Just finished installing Elsbett kit with second filter and proper re-routing of fuel lines and mileage has stayed around 20-21 no matter how I drive. 250 mile trip last weekend with extended freeway driving netted 22 mpg.
Just replaced water pump/thermostat (broken impeller) and radiator. Car has all viton fuel lines and no leaks anywhere. Engine is dry. New air filter. New synthetic (Amsoil) oil and filter. New MB coolant. New drive belt. Just ran two tanks of straight WVO and mileage is still 21 mpg.
Meanwhile throughout all of this the power of the car has been Oustanding! Extremely fast and powerful easily outrunning most cars on the road. In fact the power output has increased while the mpg has dropped.

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

If performance has markedly increased, that means your turbo usage has too.

I "notice" the whine of the turbo constantly when using B99; I attributte the fact I get 10% less mpg's to that.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)