FYI here are the gas consumption results from our Christmas trip to Tom
Forhan and south through the mountains of Giorgia, Tennessee, Alabama
and West Virginia. 

I tended to travel at 100 to 100 km/hour (63 to 70 miles/hr) on the
interstates, 90 to 100 (56 to 63 miles/hr) on rural roads and 50 to 80
(31 to 50 miles/hr) in the mountains (uphill 2nd and 3rd gear). I have
not found any correlation with the route or terrain we covered.

I used only high octane unleaded gasoline (92 to 94 octane) and added
injector cleaner/gasline antifreeze three times along the way (I don't
trust octane boosters).

Larry
'86 syncro westy

TRIP LOG OF GAS CONSUMPTION '86 SYNCRO WESTFALIA Dec/96											
Odometer	kms	miles	US	Miles/	Route		Terrain
 kms				gal	USgal	
110787	
110972		224.8	139.7	8.01			
111451		478.5	297.3	14.00	21.24	Interstate	mountains
111691		240.5	149.4	7.30	20.47	Interstate	flat
111908		217.0	134.8	6.09	22.14	Interstate	flat
112249		341.0	211.9	9.75	21.73	Interstate	flat
112557		307.8	191.3	8.88	21.54	rural		mountains
112921		363.6	225.9	12.11	18.66	Interstate	mountains
113126		205.0	127.4	7.04	18.09	rural		mountains
113422		296.2	184.0	8.38	21.96	rural		mountains
113727		304.4	189.1	9.34	20.25	rural		mountains
114025		298.4	185.4	9.40	19.73	rural		mountains
114290		265.0	164.7	7.78	21.16	rural		mountains
114597		307.0	190.8	9.75	19.57	Interstate	mountains
115011		413.4	256.9	10.72	23.96	Interstate	flat
115485		474.3	294.7	14.86	19.83	Interstate	mountains
115737		252.0	156.6	7.22	21.69	Interstate	flat
115928						
         SUM	4765	2960.3	142.62	20.76	AVERAGE