There are two missions that have bigfoot in it:
The first mission, Predator, is the mission where you snipe the O'Neil brothers in the woods.
This video shows bigfoot's location in the Predator mission (Bigfoot section at 0:44):
The second mission, The Last One, is a Franklin "Strangers and Freaks" mission.
If you want more info, go to the link below (WARNING: SPOILERS IN THE LINK):
The Last One (CONTAINS SPOILERS)
I have compiled a list using the Brady guide for GTA 5.
First, let's define the vehicle categories with the best braking stats. According to the guide:
- Ships including the submarine, as well as all Helicopters have the maximum value of 10/10 for braking.
- Bicycles come in second with a maximum of 5 points,
- Motorcycles have a maximum of 4.5 points.
- Cars, with a maximum of 3.5 points (tuning/modding not included).
- Planes are dead last with 2.5 points for one plane only, all other planes have a measly score of 1 point (the minimum is 0.5 points, so they aren't quite dead last).
Now that we've established a hierarchy, let's talk about the top of each category.
Like I said before, all ships and helicopters have maximum score, so there's no point in listing the winners here.
Among the bicycles, there is one winner, the BMX with 5 points. Aside from the Fixter with its abysmal 0.5 points, all other bicycles have either 4 or 4.5 points.
The motorcycles category has quite a number of winners (with 4.5 points):
- Dinka Double-T,
- Nagasaki Carbon RS,
- Pegassi Bati 801,
- Pegassi Bati 801RR
- Shitzu PCJ 600 .
Last place goes to the Pegassi Faggio with 1.5 points followed by the Western Daemon with 2 points. The rest range between 3.5 and 4 points.
Before we come to cars, I'd like to congratulate the (Crop) Duster for its "amazing" 2.5 points; the only plane to not score 1 point in braking.
Now comes the category everybody's been waiting for, the cars: Winners with 3.5 points are
- HVY Barracks Semi (surprisingly)
- Canis Bodhi (Trevor's car)
- Nagasaki Blazer (even though it behaves like a bike during crashes, it's got 4 wheels, so I consider it a car)
- Dewbauchee Rapid GT
- Benefactor Surano
- Bravado Banshee
- Obey 9F
- Obey 9F Cabrio
- Coil Voltic (the only car I know that's more or less silent)
- Pegassi Vacca and
- Truffade Adder
Dead last (with 0.5 points) are:
- Dock Handler,
- HVY Dozer,
- Tank,
- Ripley
- (Golf) Caddy.
Aside from the JoBuilt Hauler, the JoBuilt Phantom (both 2.5 points), the Firetruck (1.5 points) and the military HVY Barracks Semi (one of our winners), all trucks (including buses) have 1 point.
Disclaimer:
Please keep in mind that my answer is based off a work that is not related to Rockstar and may contain mistakes (I definitely found some while I used it).
Best Answer
The Truffade Adder has a stock speed of "8.6" - which makes it the fastest car in GTA V.
However I prefer the Overflod Entity XF as it has significantly better acceleration and traction - which matters more than top speed IMO.
Both cars will occasionally spawn in the game world (generally around the richer areas of Los Santos) but if you do steal one you cannot "own" it. The Adder spawns frequently in front of Sessanta Nove at Portola Drive, Rockford Hills.
To own one of these cars you need to buy them from Legendarymotorsport.net - and they're expensive with the Adder at $1,000,000 and the Entity XF at $795,000
It's reported that you can own the Entity XF via the mission "I Fought the Law" but this seems like an exploit of sorts.
If you want a fast, affordable vehicle, buy/steal a motorbike.
If you want a fast car you can buy or steal, have a look at the Schyster Fusilade:
And if you want a fast 4 seater car check out my question about that here: What is the fastest 4 seater car in Grand Theft Auto 5?