If it's only me do I pay the same price as if there were 4 riders?
The Guru Take
Rides are charged per car
The price quoted on RideGuru is always the per-car price, regardless of how many people are in your party.
The only caveat to note is that when you opt to use a pooled service, such as Uber Pool or Lyft Line, you are limited to 2 people in your party, and you may be joined by up to 2 other passengers who are going the same way as you if the app finds such a match.
However, even in those cases, you will still pay the quoted fee for both passengers in your party together. The other passengers, if any, pay their own fee separately from yours.