Impact of olefin content on criteria and toxic emissions from modern gasoline vehicles

- Changing the olefin content had a minor impact on exhaust emissions.
- Fuel olefin content had no statistically significant effect on NOx, THC, NMHC, and CO emissions.
- Some fuel effects were observed for fuel economy and CO2 emissions.
- 1,3-Butadiene emissions increased with increasing fuel olefin content.
- Benzene, formaldehyde, and acetaldehyde did not show statistically significant fuel effects.