I agree ProNAV is crap at estimating arrival time. Basically it needs to get there first before it can work out when I will get there. It seems to initially overestimate by about 50%. My Z4 was unfailingly accurate and even seemed to know how many coffee (and bathroom) stops I would need.
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E90 M3 | DCT | EDC | M-drive | AW | 19's
E91 323 18's
E46 320i
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