40 CFR § 1030.20 - Fuel efficiency metric.

---
identifier: "/us/cfr/t40/s1030.20"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 1030.20 - Fuel efficiency metric."
title_number: 40
title_name: "Protection of Environment"
section_number: "1030.20"
section_name: "Fuel efficiency metric."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "U"
subchapter_name: "AIR POLLUTION CONTROLS"
part_number: "1030"
part_name: "CONTROL OF GREENHOUSE GAS EMISSIONS FROM ENGINES INSTALLED ON AIRPLANES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401-7671q."
regulatory_source: "86 FR 2171, Jan. 11, 2021, unless otherwise noted."
cfr_part: "1030"
---


# 1030.20 Fuel efficiency metric.

For each airplane subject to this part, including an airplane subject to the change criteria of § 1030.35, a fuel efficiency metric value must be calculated in units of kilograms of fuel consumed per kilometer using the following equation, rounded to three decimal places:

Where:

SAR = specific air range, determined in accordance with § 1030.23.

RGF = reference geometric factor, determined in accordance with § 1030.25.