system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 - remapping a car??

Remapping a car gives better fuel economy and improved performance, why is this 'map' not as standard from the manufacturer? Do they purposely make vehicles underperform and fuel hungry?
gpt
The map from the manufacturer is designed to get the car through various economy and emissions tests.  These tests (depending on country) will run the car at different RPM, temperatures, etc.  The map is also designed to work for a specific fuel octane rating.  On cars without turbochargers, there is limited improvements that a tuner map will provide.  The power curve might be moved around a bit, and you might get better economy at a different speeds, but in the end you will not be getting a huge gain.  Turbo motors, however, see great improvements.  Tuner maps allow the turbos to spool up longer, and increase power dramatically.  But, there is no free lunch.  You will burn more fuel, and have higher emissions.