---
kind: "section"
citation: "40 C.F.R. § 1065.725"
title: "40"
number: "1065.725"
heading: "High-level ethanol-gasoline blends."
url: "https://uscodex.org/cfr/40/1065.725"
---

# §1065.725. High-level ethanol-gasoline blends.


For testing vehicles capable of operating on a high-level ethanol-gasoline blend, create a test fuel as follows:

- (a) Add ethanol to an E10 fuel meeting the specifications described in [§ 1065.710](/cfr/40/1065.710.md) until the ethanol content of the blended fuel is between 80 and 83 volume %.
- (b) You may alternatively add ethanol to a gasoline base fuel with no ethanol if you can demonstrate that such a base fuel blended with the proper amount of ethanol would meet all the specifications for E10 test fuel described in [§ 1065.710](/cfr/40/1065.710.md), other than the ethanol content.
- (c) The ethanol used for blending must be either denatured fuel ethanol meeting the specifications in [40 CFR 1090.270](/cfr/40/1090.270.md), or fuel-grade ethanol with no denaturant. Account for the volume of any denaturant when calculating volumetric percentages.
- (d) The blended test fuel must have a dry vapor pressure equivalent between 41.5 and 45.1 kPa (6.0 and 6.5 psi) when measured using the procedure specified in [§ 1065.710](/cfr/40/1065.710.md). You may add commercial grade butane as needed to meet this specification.

## Notes

### Amendments

[79 FR 23811, Apr. 28, 2014, as amended at 85 FR 78468, Dec. 4, 2020]

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 70 FR 40516, July 13, 2005, unless otherwise noted.

### Amendments

[79 FR 23811, Apr. 28, 2014, as amended at 85 FR 78468, Dec. 4, 2020]