Sixt ACRISS codes / upgrade paths
 

I made a similar post a couple of weeks ago so hopefully it's ok to make a new one as this is slightly different, I am going to status match across to Platinum from Avis president, I'll be renting from LGW primarily possibly LHR. Checking the UK fleet here for saloon only:

https://www.sixt.co.uk/funnel/#/flee...ctyp=limousine

I would like to end up with a Mercedes CLA (FDAR), Mercedes E class (PDAR), BMW 5 series / Audi A6 (not listed but I am sure they have them) after an upgrade. I know upgrades are not guaranteed and sometimes not offered at all but I would like to know what upgrade paths are actually possible based on the fleet. I found a list of the codes here:

https://www.sixt.co.uk/acriss-code/#/

Would these examples be correct:

BMW 1 series automatic (ILAR) -> Skoda Superb (SDAR) ?
Skoda Superb (SDAR) -> Mercedes CLA (FDAR) (this would be odd seeing as it's £1 difference per day?)
Mercedes CLA (FDAR) -> Mercedes E class (PDAR) ? (Guessing 5 series and A6 would also sit here).

Any insights would be greatly appreciated, thanks.

I don't have any internal Sixt listing that would match up original and upgrade codes, but I think you may be able to gleam some info from the Upgrades thread on this forum?