If you don't plan on driving outside the strip & downtown areas, Uber and Lyft are reportedly cheaper than taxis. The ride is a flat fee based on point-to-point, so you aren't subject to taxi drivers trying to jack up the fare by taking a longer route.
There's even an Uber/Lyft location at the airport, separate from the taxis, shuttles and limos.
So, if your circumstances don't require a car for lots of off-strip travel, taking an Uber between casinos, to shows, shopping and so on might be cheaper and more convenient now that parking and gas prices need to be included in the cost analysis.