I did the resistor mod some time ago...actually I forgot all about it. but I still have the resistor in a plastic case with my owners manual. and yes army, I did do the test which you are talking about, I gauged it at 24 mpg. filled the tank, drove until almost empty then I refilled.....I put in about 12. something gallons divided by 300 and so thats how I got my total. actually I forgot to mention that I used to run on 185/60/R15 but I had my tires swapped to 205/65/R15 for a smoother ride, could that be the issue?

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1990 190E 3.0L