Sunoco EXO2 is a very highly oxygenated race fuel. EXO2's high oxygen content - about three times as much as pump gas - can be beneficial in crate engines, two-barrel engines, and racing classes with cylinder head limitations, as well as engines running at higher elevations.
Due to its high oxygen content, Sunoco EXO2 requires a richer air/fuel mixture. Using EXO2 without proper air/fuel mixture changes can lean out your engine. Please consult the stoichiometric air/fuel ratio data in the Technical Details section below. Since non-oxygenated race fuels typically have a stoichiometric air/fuel ratio of 14.6:1 to 15.1:1, you may need to richen your fuel mixture by 10 to 15 percent when using EXO2 depending on the fuel you are currently using.
Legal Notice
Disclaimer:
Legal in California only for racing vehicles in sanctioned racing events.
Legal:
For off-road and racing applications only.
| Color | Light Orange |
| Octane (R+M)/2 | 110 |
| Research Octane | 115 |
| Motor Octane | 105 |
| Specific Gravity | 0.75 |
| Weight (lbs/gallon) | 6.3 |
| Reid Vapor Pressure | 7.3 |
| 10% Evaporation | 139 |
| 50% Evaporation | 160 |
| 90% Evaporation | 225 |
| Final Boiling Point | 241 |
| Stoichiometric Air/Fuel Ratio | 13.2 |
| Oxygen (Weight%) | 10 |
| HC Ratio | 2.22 |
| OC Ratio | 0.1 |
| Lower Heating Value (Btu/Pound) | 16,700 |
| Lower Heating Value (Btu/Gallon) | 102,600 |
| Leaded | Yes |
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