Keith,

FWIW, I also have an '86 Westy w/ Tiico conversion -- installed last fall 
-- and my gas mileage has been in the same range as you describe.   I don't 
have access to the Vag-Com probe/software, so cannot comment on the 
readings you describe.

At 02:07 PM 5/31/2002 -0700, you wrote:
>Fellow Tiico Nuts,
>
>I have an '86 Westy with a Tiico conversion (about 4K on the engine
>now) and I've been fighting with low gas mileage. Currently I get
>about 18-19 mpg (65 mph freeway, unloaded, just me in it) up to
>about 21mpg (40-50 mph back roads). Mileage was a lot worse, but
>while on a trip, I replaced the O2 sensor with a generic 3-wire
>(all I could find), and picked up about 3mpg.
>
>I bought the VagCom software to interface/trouble shoot this puppy
>and here's what I've seen:
>
>Initially, (after O2 sensor replacement and error codes cleared)
>had the following DTC's:
>
>00561 Fuel Mixture Adjustment
>         14-10 Adaptation Limit (add) Exceed - Intermitent
>
>00525 O2 Sensor (G39)
>         03-10 No-Signal - Intermittent
>
>At this point, I reset everything (timing - 10�BTDC, CO, Basic
>setting), and redid the O2 sensor connections (crimped & soldered).
>Also traced down all the O2 sensor wires from plug to ECU, and all
>check out OK. At Peter's suggestion, I pulled the MAP sensor and
>cleaned it, and it appears to work fine.
>
>Since then, I've gotten the following DTC's:
>
>01247 Evap Canister Purge Regulator Valve (N80)
>         37-00 Faulty
>
>00561 Fuel Mixture Adjustment
>         12-10 Adaptation Limit (mul) Exceed - Intermitent
>
>00537 O2 Sensor Regulation
>         27-00 Implausible Signal
>
>         (This second one is the only one I've seen in the last 200 miles
>or so.)
>
>Anyone have any suggestions?
>
>Also, using the VagCom, I've tried to make sense out of the Group
>00 numbers, and some of them seem reasonable (engine load, coolant
>temp [in �F however], RPM [needs a X10 multiplier]) but some make
>no sense at all. Like for instance, position #2 is supposed to be
>battery voltage, and my reading is "184". A snapshot of my Group 00
>readings is:
>
>1       2       3       4       5       6       7       8       9       10
>152     184     212     029     128     133     002     009     009     091
>
>Are these numbers comparable to what you folks have been seeing?
>Any help/suggestions appreciated. Thanks,
>
>Keith Hughes

Ray Reinhard
'86 Tiico Westy Camper GL