I did a full tank of B50 and got me about 35mpg.
This was about 50/50 city and highway. I think it would have been better if the air suspension was level. Right now the rear is dropped lower than the front.... till I fix it.
If the air ride is acting wackey follow the reset procedure guide found here
http://allroadfaq.com/main/index.ph...pension-service&catid=40:suspension&Itemid=67
or try this if you have a VC Cable.
Put the Allroad in JackMode by holding the up & Down button for approx 10 seconds. The Green indicators will stay illuminated and the suspension light will illuminate on the dash.
Open VCDS > Once connected > Select Control Module > 34 - Level Control > Select "Login", enter code 08367 > Basic Settings button > enter group 026, once initialized push the UP button to start the fill of the front axle. This process can be repeated until the front bags inflate.
Group 026 = Continue to 027 to fill front axle
Group 027 = Fill front Axle with 9 Bar
Group 028 = Continue to 028 to fill rear axle
Group 029 = Fill rear axle with 9 bar
Group 030 = Continue to 031 to fill Reservoir tank with 13 bar
Group 031 = Fill Reservoir tank with 13 bar