I think this is an excellent suggestion - I ended up removing the two 'caps' to my diesel Xtrail 'saddle tanks and siphoning the mix out - it also gave me an opportunity to blow the lines out with compressed air, replace the filter and restart.
I think the Q7 owner got 'ripped off'. I did end up having to rebuild the HPFP but I did drive over 100ks on a 50/50 mix = cost under $1k at a Bosch specialist. Have done nearly 10,000ks since will no other issues.
2001 Bora 4Motion from new, upgraded Haldex controller, Bilsteins, Milltek
2014 Golf 90TSi, Comfortline, manual
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