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This final report evaluates an I-80 eco-driving feedback field test using a large sample of 118 drivers (140 driver-vehicle combinations) over two months. Participants used a fuel consumption recording and display device with one month baseline (blank display) and one month active feedback, randomly assigned among three designs. Overall fuel consumption decreased 2.7% with feedback, with reductions in trip speeds and acceleration. Savings varied by design (1.9% to 2.9%) and by driver sex, and goal alignment produced up to a 22% improvement.",{"@graph":69,"@context":127},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/ecodrive-i-80-final-report-fuel-economy-feedback-field-test-results/296769/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/ecodrive-i-80-final-report-fuel-economy-feedback-field-test-results/296769.png","ImageObject",300,407,{"name":92,"@type":93},"Seraphina","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-07","2026-09-18",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",11,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119,123],{"name":110,"@type":111,"acceptedAnswer":112},"What was the purpose of the EcoDrive I-80 field test?","Question",{"text":113,"@type":114},"The study tested whether in-vehicle energy feedback helps drivers adopt more fuel-efficient driving styles by delivering accurate, ongoing information about their specific driving situations.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How was the field test structured for participants?",{"text":118,"@type":114},"Each participant used a commercially available fuel consumption recording and display device for two months: the first month used a blank display as a baseline, and the second month turned the display on.",{"name":120,"@type":111,"acceptedAnswer":121},"What were the overall effects of feedback on fuel economy and driving behavior?",{"text":122,"@type":114},"Using a mixed-effects model controlling for road grade and weather, the report finds a statistically significant 2.7% decrease in fuel consumption rate overall. Drivers also reduced median trip speeds and mean acceleration rates in response to feedback.",{"name":124,"@type":111,"acceptedAnswer":125},"How did display design and driver characteristics influence savings?",{"text":126,"@type":114},"The three designs produced impacts ranging from 1.9% to 2.9%, and driver sex was a stronger determinant of savings, with men averaging 1.9% and women 5%. Alignment between pre-feedback driver goals and certain designs led to a group achieving a 22% improvement, and an estimated 9.2% overall savings if each driver saw the optimal screen for their goal.","https://schema.org",{"og:url":83,"og:type":129,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":131,"canonical":83},"index,follow",{"doc_id":133,"site_id":62},296769,1789736552,{"code":4,"msg":5,"data":136},{"doc_id":133,"user_id":137,"nickname":92,"user_avatar":138,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":139,"file_id":140,"file_url":141,"file_type":142,"file_size":143,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":144,"language":145,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":146,"faqs":147,"seo_title":148,"seo_description":67,"update_tm":134,"read_time":149,"preview_page_count":4},962075114101,"https://ap-avatar.wpscdn.com/avatar/e000253a75eb197efd?x-image-process=image/resize,m_fixed,w_180,h_180&k=1780044092746381165","ECODRIVE I-80: A LARGE SAMPLE FUEL ECONOMY FEEDBACK FIELD TEST  \nFINAL REPORT  \nKenneth S. Kurani  \n[knkurani@ucdavis.edu](knkurani@ucdavis.edu)  \nTai Stillwater  \n[tstillwater@ucdavis.edu](tstillwater@ucdavis.edu)  \nMatt Jones  \nNicolette Caperello  \nInstitute of Transportation Studies  \nUniversity of California, Davis  \n1605 Tilia Street  \nSuite 100  \nDavis, CA 95616  \nReport: ITS-RR-13-15  \nReport Submitted in fulfillment of requirements of contract: Oak Ridge National Laboratory: 4000102856  \nABSTRACT  \nEnergy feedback in the vehicle dashboard is one method to engage drivers in energy saving driving styles. In contrast to the occasional broadcasting of general driving tips, in-vehicle energy feedback gives drivers access to accurate information about their specific driving situation on an ongoing basis. The increasing prevalence of such feedback in new vehicles suggests a belief that the latter is effective. However, there is little reliable evidence of the effectiveness of energy feedback in real-word driving in passenger vehicles. This study begins to fill this gap. This report presents the results of a large sample eco-driving feedback study that includes 118 drivers (140 driver-vehicle combinations); the drivers reside in selected cities along the Interstate-80 corridor from San Francisco, CA to Reno and Sparks, NV. Participants are given a commercially available fuel consumption recording and display device to use in their personal vehicle for two months. The first month the display was left blank to record a baseline of driving and fuel consumption: the second month the display was switched on. The devices display one of three display designs spanning a variety of feedback modes; drivers are randomly assigned which design they will see. Using a mixed-effects linear model that controls for road grade and weather conditions, we find a statistically significant decrease of 2.7% in fuel consumption rate (grams of gasoline per meter) between the without and with-feedback months overall. We also find that drivers reduced their median trip speeds and mean acceleration rates in response to feedback. The three display designs ranged from 1.9% to 2.9% impact. Driver sex was an even greater determinant of savings with men averaging 1.9% and women 5% savings. Finally, the alignment of pre-feedback driver goals with certain designs resulted in one group achieving a 22% improvement, and we estimate that if each driver had received the optimal screen for his or her goal (rather than a random assignment) the group would have saved 9.2% overall. Analysis of households’ exit interviews reveals that while many households claim that achieving good fuel economy is a goal oftheir driving, few can name more than three things they could do or actually do to increase fuel economy. Motivations for higher fuel economy span a range of cost savings, energy security, conservation, environmental protection, and climate change. A thematic analysis of the interview text produces a structure of four main themes, i.e., driving contexts, sense of personal control, learning, and durability over time of behaviors. Feedback can affect each of these themes and act as a bridge between them, e.g., increasing a sense of personal control over fuel economy can be accomplished by learning from feedback how personal actions affect fuel economy across driving contexts.  \nACKNOWLEDGEMENTS  \nThis research is funded by the U.S. Department of Energy through Oak Ridge National Laboratory. Our thanks to CSAA Insurance Group, a AAA Insurer for their assistance in recruiting participants. The University of California Sustainability Center provided additional funding. Our thanks to Lauryn Robinson for her assistance in summarizing and coding interview transcripts. The authors are solely responsible for the contents.  \nTABLE OF CONTENTS  \nLIST OF FIGURES vi  \nLIST OF TABLES vii  \nINTRODUCTION 1  \nBackground 1  \nReview of Driver Feedback Studies 1  \nDESCRIPTION OF THE I-80 E","cbCaiaxNAEHG6wlP","https://ap.wps.com/l/cbCaiaxNAEHG6wlP","pdf",1145279,58,"English","# INTRODUCTION\n## Background\n## Review of Driver Feedback Studies\n# DESCRIPTION OF THE I-80 ECO-DRIVE FIELD TEST\n## Study Regions and Household Selection Process\n## Sample Description\n## Household Size and Composition\n## Driving context: Temperature\n## Flow of the Field Test from a Household Perspective\n## Three Feedback Screens\n# DATA TREATMENT AND ANALYSIS\n## Vehicle Data for Fuel Economy Calculations\n## Trip Contextual vs. Behavioral Factors\n## Trip types\n## Analysis Methodology\n## Driver Data: Questionnaires and Interviews\n## Interview Summaries\n## Interview Thematic Analysis\n# RESULTS: ESTIMATION OF ON-ROAD FUEL ECONOMY\n# RESULTS: THE INFLUENCE OF ATTITUDES AND DEMOGRAPHIC FACTORS\n# RESULTS: INTERVIEW SUMMARIES AND THEMATIC ANALYSIS\n## Was achieving high fuel economy a goal of your driving prior to the study? Why?\n## Do you already have a fuel economy (MPG) display in your car?\n## What can any driver do to increase fuel economy? What did this driver do prior to field test? What do they do now?\n# RESULTS: THEMES—CONTEXT, CONTROL, LEARNING, DURABILITY\n## Context: Situations in which it is Good/Bad to use Fuel Economy Display\n## Perception of Personal Agency/ Control over Fuel Economy\n## What did Participants Learn?\n## Durability of any behavior changes made during the field test\n# CONCLUSIONS\n# REFERENCES","[{\"question\":\"What was the purpose of the EcoDrive I-80 field test?\",\"answer\":\"The study tested whether in-vehicle energy feedback helps drivers adopt more fuel-efficient driving styles by delivering accurate, ongoing information about their specific driving situations.\"},{\"question\":\"How was the field test structured for participants?\",\"answer\":\"Each participant used a commercially available fuel consumption recording and display device for two months: the first month used a blank display as a baseline, and the second month turned the display on.\"},{\"question\":\"What were the overall effects of feedback on fuel economy and driving behavior?\",\"answer\":\"Using a mixed-effects model controlling for road grade and weather, the report finds a statistically significant 2.7% decrease in fuel consumption rate overall. Drivers also reduced median trip speeds and mean acceleration rates in response to feedback.\"},{\"question\":\"How did display design and driver characteristics influence savings?\",\"answer\":\"The three designs produced impacts ranging from 1.9% to 2.9%, and driver sex was a stronger determinant of savings, with men averaging 1.9% and women 5%. Alignment between pre-feedback driver goals and certain designs led to a group achieving a 22% improvement, and an estimated 9.2% overall savings if each driver saw the optimal screen for their goal.\"}]","EcoDrive I-80 - Final Report - Fuel Economy Feedback Field Test Results | PDF",146]