It would seem DeadStick that based on the information from your previous post that your warranty is void unless there is a subsequent SB after JSL007-4 from December 6th 2011.
http://www.jabiru.net.au/Service%20B...l_Guidance.pdf
DeadStick1 Fuel used primarily is Caltex 98, but when away, fuelling at other strips they use avgas.
(Not my boldings)
3.3 Shandies
A "shandy" is a mix - for the purposes of this letter it is a mix of any 2 or more different fuels.
In some areas it has become popular to operate Jabiru engines on a shandy of AVGAS and MOGAS. This might be done to reduce the cost of fuel, to reduce lead buildup in the combustion chamber, to "beef up" the octane rating of a sub-standard fuel or other reasons.
This practice is unsafe. Jabiru Aircraft do not endorse it and may void any warranty of an engine or aircraft which has been operated using such a fuel.
In terms of chemical composition AVGAS is totally different to MOGAS. A petroleum company representative described mixing the two as similar to "mixing Gin with Beer".
Hardcore cocktail fans aside, mixing these drinks is a bad idea – it tastes bad and the after affects can be messy & expensive. There is potential for elements in the fuels to react to each other and the finished blend would have unknown knock resistance – because the fuels are so complex you cannot assume that mixing 110 RON AVGAS with 91 RON MOGAS – at almost any mixing proportion – will result in a fuel with acceptable knock resistance for a Jabiru aero engine.