This has actually been happening for a while. I guess the reason I hadn't noticed it sooner is that I have been running my car on diesel the past couple of months. I had a frybrid vegetable oil kit professionally installed around February. Perhaps I should have mentioned that but it didn't seem relevant until now. Why? Because I had my wvo tank filled up for the first time in a while on Friday for a trip to Santa Cruz. I haven't tested the down shifting yet, although, the rpms drop to idle speed much more smoothly on wvo than when running diesel. High tachometer reading remains at freeway speed.
If it's the fuel that is causing me problems then I'm kind of stumped. I couldn't really find anything relating to my issue on the Frybrid forum. Could it be that durring the conversion they adjusted the bowden cable or something to shift better on oil? I know they had to take off the intake manifold which required them to partially disassemble the throttle linkage. Anyway, I wouldn't be surprised if my problem has multiple sources. I will be replying more often now that I'm back as well.[/quote]

from my standpoint, I think that the conversion should have been mentioned from the gitgo. The individuals that answered your posts, did so on the assumption that you were running standard diesel fuel that was called for in the owners manual, and were basing their suggestions on that assumption. Now, the conversion is mentioned, and anyone running a standard system is in the dark as to what was done, who did it, and what effect the conversion would have on your mileage. I don't mean to sound harsh, but when modifications are made to a car, those modifications sometimes cause issues that are detrimental to the car in question. When I see a post concerning WVO, I pass it right by because I have no idea what the effect of running that fuel would have on a car, and can be of no help regarding suggestions. Good luck with finding an answer to you problem.

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96 E300d