I would like to hear from anyone who has removed the trap cat from his/her 1985 300D. What improvement in fuel economy did you see? Not theoretical numbers or EPA numbers or "hoped for" numbers but actual before and after miles per gallon numbers.

My "test pipe" installation is still so new that I don't have any numbers to share with the prospective buyers of my car. All I have are two years of data with the trap cat: around town on B100 biodiesel, about 21 MPG. On the road, mostly D2 with some biodiesel, 24 MPG with a high of 26 once when I tried driving 65 mph (dangerous, nearly got squashed by the trucks ).

With the trap cat now replaced by a test pipe, running B20 because B100 has gotten so expensive, I would expect to see 23-24 around town and 27-28 on the road. Lacking any experience with a Federalized '85, I ask you to share your data.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970