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Fuel Economy and Engine Perfomance Issues

By Kortum, Dacid J.

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Book Id: WPLBN0000092370
Format Type: PDF eBook
File Size: 0.5 MB
Reproduction Date: 2007
Full Text

Title: Fuel Economy and Engine Perfomance Issues  
Author: Kortum, Dacid J.
Volume:
Language: English
Subject: Ecology, Natural resource issues, Environemtal protection
Collections: Environmental Awareness Library Collection
Historic
Publication Date:
Publisher: United States Environmental Protection Agency

Citation

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Kortum, D. J. (n.d.). Fuel Economy and Engine Perfomance Issues. Retrieved from http://www.worldebooklibrary.net/


Description
Excerpt: Oxygenates have been used in gasoline since the 1970s as fuel extenders or octane enhancers. During the 1980s, oxygenates came into wider use as some states implemented oxygenated gasoline programs for the control of carbon monoxide (CO) pollution. Denver, Colorado, implemented the first oxygenated gasoline program in 1988. C The 1990 Clean Air Act Amendments required oxygenated gasoline programs in several areas of the country that failed to attain the National Ambient Air Quality Standards (NAAQS) for CO. Many new oxygenated gasoline programs were first implemented during the winter months of 1992–1993. C Consumers in some areas of the country expressed concerns that oxygenated gasoline has led to large reductions in fuel economy or poor engine performance. This chapter examines existing studies and literature related to fuel economy and engine performance. Large fuel economy losses (as high as 20%) have been claimed by some consumers. C With regard to fuel economy, the theoretical change in fuel economy as a result of the addition of oxygenates to gasoline is in the range of a 2% to 3% reduction in fuel economy. Existing research indicates that “real world” fuel economy changes correspond to changes in energy content. A 2% to 3% reduction in fuel economy equates to a less than 1 mile per gallon change in fuel economy for a car that averages 27 miles per gallon.

Table of Contents
CONTENTS EXECUTIVE SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 SCOPE OF THE CHAPTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 FUEL ECONOMY 3-6 Measurement Variability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 Ambient Temperature Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 Seasonal Fuel Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 Theoretical Basis for Fuel Economy Changes Due to Oxygenates . . . . . . . . . 3-8 Studies Related to Fuel Economy Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9 ENGINE PERFORMANCE ISSUES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11 Enleanment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 Fuel Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13 Antiknock Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14 Improper Fuel Handling and Storage Practices . . . . . . . . . . . . . . . . . . . . . . . 3-15 Water Absorption/Phase Separation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 Materials Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16 Fuel Mixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18 CONCLUSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

 

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