The National Center for Advanced Technology (NCAT), part of the National Vehicle and Fuel Emissions Laboratory (NVFEL), assesses the effectiveness of advanced low emission and low fuel consumption technologies for a broad range of key light-duty vehicles, engines and transmissions.  In support of this work, the NCAT team developed techniques to combine engine operating test data into a set of complete engine maps suitable for use in complete vehicle simulation models and other technical analyses.  

These complete engine maps estimate an engine’s fuel consumption over its complete operating range spanning idle and motoring, wide-open-throttle and a predefined redline speed.  For each engine analyzed, NCAT uses an in-house modeling tool to combine engine test data from benchmarking tests and/or other sources like technical papers and conference presentations into consistent, publishable, complete engine maps.

Following EPA’s commitment to transparency, NCAT is providing access to the complete engine maps for use in other models, technical analyses, and publications. The files below contain images of complete engine maps, tabular data in a spreadsheet file corresponding to the complete engine map images, a document describing the process for combining the data for the maps, and the Matlab input file NCAT uses in its vehicle simulation model.  Please use the citation included in each document when referencing any of these documents.

Sample Complete Engine Map for Fuel Consumption (BSFC)

For more information on NCAT's process for constructing complete engine maps for use in complete vehicle simulation models like ALPHA, see:

• SAE 2018-01-1412 Constructing Engine Maps - Presentation at the April 2018 World Congress

For more information on benchmarking and the associated test data packages, see:

• Benchmarking Advanced Low Emission Light-Duty Vehicle Technology

Complete Engine "ALPHA Maps" (based on benchmarking data)​

• 2018 Toyota 2.5L A25A-FKS Engine Tier 2 Fuel - ALPHA Map Package - Dated 07-30-20 (ZIP)(1 MB, July 2020)
• 2018 Toyota 2.5L A25A-FKS Engine Tier 3 Fuel - ALPHA Map Package - Dated 07-30-20 (ZIP)(977 K, July 2020)
• 2016 Mazda 2.5L Turbo Skyactiv-G Engine Tier 2 Fuel - ALPHA Map Package – Dated 03-13-19 (ZIP)(1 MB, March 2019)
• 2016 Mazda 2.5L Turbo Skyactiv-G Engine Tier 3 Fuel - ALPHA Map Package – Dated 03-13-19 (ZIP)(1 MB, March 2019)
• 2016 Honda 1.5L L15B7 Engine Tier 2 Fuel - ALPHA Map Package - Dated 02-04-19 (ZIP)(1 MB, February 2019)
• 2016 Honda 1.5L L15B7 Engine Tier 3 Fuel - ALPHA Map Package - Dated 02-04-19 (ZIP) (979 K, February 2019)
• 2013 Ford 1.6L EcoBoost Engine Tier 2 Fuel - ALPHA Map Package - Dated 10-25-18 (ZIP)(868 K, December 2018)
• 2013 Ford 1.6L EcoBoost Engine LEV III Fuel - ALPHA Map Package - Dated 10-25-18 (ZIP)(848 K, December 2018)
• 2014 Chevrolet 4.3L EcoTec LV3 Engine Tier 2 Fuel - ALPHA Map Package - Dated 10-25-18 (ZIP)(2 MB, December 2018)
• 2014 Chevrolet 4.3L EcoTec LV3 Engine LEV III Fuel - ALPHA Map Package - Dated 10-25-18 (ZIP)(2 MB, December 2018)
• 2015 BMW 3.0L N57 Engine Diesel Fuel - ALPHA Map Package - Dated 06-11-18 (ZIP)(879 K, December 2018)
• 2013 Chevrolet 2.5L Ecotec LCV Engine Reg E10 Fuel - ALPHA Map Package – Dated 03-05-18 (ZIP)(682 K, March 2018)
• 2014 Mazda 2.0L Skyactiv Engine Tier 2 Fuel - ALPHA Map Package - Dated 03-29-18 (ZIP)(712 K, March 2018)
• 2014 Mazda 2.0L Skyactiv Engine LEV III Fuel - ALPHA Map Package - Dated 03-29-18 (ZIP)(693 K, March 2018)
• 2015 Ford 2.7L EcoBoost V6 Engine Tier 2 Fuel – ALPHA Map Package – Dated 11-27‐19 (ZIP)(887 K, November 2019)
• 2015 Ford 2.7L EcoBoost V6 Engine Tier 3 Fuel – ALPHA Map Package – Dated 11-27‐19 (ZIP)(854 K, November 2019)

Complete Engine "ALPHA Maps" (based on modeled, published or simulation data)

• Process for Generating Engine Fuel Consumption Map: Ricardo Baseline Standard Car Engine Tier 2 Fuel
• Process for Generating Engine Fuel Consumption Map: Ricardo Cooled EGR Boost 24-bar Standard Car Engine Tier 2 Fuel
• Process for Generating Engine Fuel Consumption Map: Future Atkinson Engine with Cooled EGR and Cylinder Deactivation
• Honda 1.5L Turbo Prototype Engine from 2016 SAE Paper - Alpha Map Package - Dated 04-11-18 (ZIP)(1 MB, April 2018)
• Toyota 2.5L TNGA Prototype Engine from 2016 Aachen Paper - ALPHA Map Package - Dated 04-11-18 (ZIP)(877 K, April 2018)