E85 will offer a substantial drop in economy, as it takes more fuel to power
the engine (The fuel contains less power).
I only ran 2  tanks of E85. The first tank, was still half full of gasoline
when I filled it with E85. That tank yielded 18.5 mpg. Then, once that tank
was empty, I filled up with E85 and got about 120 miles into the tank when
my MIL light came on. I pulled aside and pulled out my handy code
reader/reprogrammer and checked my code. The code that had been thrown was
"Engine too lean" or something along those lines, so i phoned up BOSTIG who
were ready to help, and since I wasn't running the E85 tune on the engine
but rather still the Gasoline Tune hoping it could richen ittself
accordingly, and had been REALLY romping on it (77mph because I was in
Nebraska, and wanted to be out of Nebraska!), the proposal to fill with
gasoline and continue on my way untill I could download the E85 tune from
them worked fantastically. With that said, I got about 17.5 mpg on that tank
of strait E85. I haven't tried since, but once I get the E85 tune which
optimizes fuel enrichment, I should be running sweet on corn!
I am currently running happily as can be on cheap 85 octane in the
mountains, and still getting great gas mileage. Still better than my old
WBX!

-Craig
'85GL turned WESTY
Bostig in the back.

On Wed, Jun 3, 2009 at 6:11 PM, pdooley <psdooley@verizon.net> wrote:

> Wow, I'm jealous, of the engine and the trip...
>
> What kind of mileage were you getting with the E85?
>
>
>