[Vwdiesel] Biodiesel MPG?

[Tad]

I run mostly B99 (B50 in winter) in my 01 TDI, and I've noticed a slight
drop in MPG - maybe 2-3 MPG difference between B0 and B99.


On Mon, Dec 9, 2013 at 9:59 PM, William J Toensing <toensing at att.net> wrote:

> On 11/13, I  drove from Nevada City, CA down to Carlsbad, CA (just north
> of San Diego) with my Mercedes E300 diesel to attend an antique radio swap
> meet. In Sacramento, I tanked up with B-20 biodiesel, I refilled with
> regular diesel at Frazier Park, atop the Grapevine & averaged 25 MPG. I
> then drove thru LA to Carlsbad using the A/C as it was up to 93F in LA. On
> Sat., 11/16/ I left Carlsbad & refilled at the top of the Grapevine &
> averaged 34 MPG. Then from the Grapevine to Sacramento where I could refill
> with B-20 biodiesel, I averaged 36 MPG! No A/C used on the return trip. I
> always thought you could get the same MPG with biodiesel as with regular
> ULSD diesel but now I am wondering. I am sure some of you have been running
> biodiesel from B-5 to B-100. What has been your experience with MPG when
> running ULSD to biodiesel.
> I have been using  the B-20 biodiesel as I feel it provides better
> lubrication for the injection pump & I understand B-5 is mandated in all
> diesel in Europe for environmental & balance of payment reasons. Am I
> correct?
>
> For those of you who have been wondering, I have not worked on my 1982 VW
> Quantum TD since I got my Mercedes E300 a year & a half ago, but have not
> given up on it. I feel I need to find someone in the Sacramento area who
> really knows how to get the timing right on VW diesels. The independent
> Mercedes mechanic I have found is reasonable & really knows his stuff but
> will only work on Mercedes cars. I have not had any trouble with my E300
> since he corrected the check engine light with the help of his $20,000
> Mercedes engine code reader. The normal OBD 2 code reader from 1996 on is
> useless on a Mercedes. I have become so backlogged on my email that I have
> been unable to read all the recent postings from this VW diesel discussion
> group.
>
> Bill Toensing, Nevada City, CA
>
>
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