---
kind: "section"
citation: "40 C.F.R. § 1090.1355"
title: "40"
number: "1090.1355"
heading: "Calculation adjustments and corrections."
url: "https://uscodex.org/cfr/40/1090.1355"
---

# §1090.1355. Calculation adjustments and corrections.


Adjust measured values as follows:

- (a) **Adjust measured values for total vapor pressure as follows—**
- (b) For measuring the sulfur content and benzene content of gasoline, adjust a given test result upward in certain circumstances, as follows:
  - (1) If your test method involves a published procedure with a Pooled Limit of Quantitation (PLOQ), treat the PLOQ as your final result if your measured result is below the PLOQ.
  - (2) If your test method involves a published procedure with a limited scope but no PLOQ, treat the lower bound of the scope as your final result if your measured result is less than that value.
  - (3) If you establish a Laboratory Limit of Quantitation (LLOQ) below the lower bound of the scope of the procedure as specified in ASTM D6259 (incorporated by reference in [§ 1090.95](/cfr/40/1090.95.md)), treat the LLOQ as your final result if your measured result is less than the LLOQ. Note that this option is meaningful only if the LLOQ is less than a published PLOQ, or if there is no published PLOQ.
- (c) **For measuring the sulfur content of ULSD at a downstream location, subtract 2 ppm from the result.**
- (d) For measuring the benzene content of butane and pentane, report a zero value if the test result is at or below the PLOQ or Limit of Detection (LOD) that applies for the test method.
- (e) If measured content of any oxygenate compound is less than 0.20 percent by mass, record the result as “None detected.”

## Notes

### Amendments

[85 FR 78469, Dec. 4, 2020, as amended at 90 FR 4361, Jan. 15, 2025; 90 FR 24518, June 11, 2025]

### Authority

Authority: 42 U.S.C. 7414, 7521, 7522-7525, 7541, 7542, 7543, 7545, 7547, 7550, and 7601.

### Source

Source: 85 FR 78469, Dec. 4, 2020, unless otherwise noted.

### Amendments

[85 FR 78469, Dec. 4, 2020, as amended at 90 FR 4361, Jan. 15, 2025; 90 FR 24518, June 11, 2025]