For a good getaway vehicle which is the fastest 4-seater car in Grand Theft Auto 5?
As @turbo mentions in the comments below acceleration is also an important consideration.
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I've just discovered and trawled through this helpful site which lists all of the GTA5 vehicles: https://googledrive.com/host/0B-Q7WnzcPvLtLVVoM3otTVlnOFE/all.htm
It looks like the faster 4 seater is the Ubermacht Oracle 1 - with a speed of "8.1" and an acceleration of "6.8". Although there are many cars with a speed of "8.0" (but not as good acceleration).
After a bit more homework I've also identified these two cars - the Bravado Buffalo (cheap and plentiful) and the Dewbauchee Exemplar having very similar speed and acceleration stats - but better traction:
I should add that after months of playing the game my "go to" 4-door is the Lampadati Felon for it's handling. The Felon is rare but stealable so can be used as the primary car from the beginning of the GTA Online campaign.
It is also worth noting that as of the I'm Not a Hipster Update, the Bravado Buffalo S, or Franklin's Buffalo, can be purchased from southernsanandreassuperautos.com for $96,000. It has the same stats as the Dewbauchee Exemplar, but a faster acceleration at "7.5". http://gta5.consolegameswiki.com/wiki/Bravado_Buffalo_(Franklin)
I would choose the Exemplar. But check out is full list of 4-seaters: http://www.gtaguru.com/best-4-seater-cars-in-gta-v/