NACFE Reports Diesel Trucks Achieve 11.5 MPG; Tesla Semi Validates 460-Mile Range in Real-World Test

During the NACFE's 'Run on Less - Messy Middle' demonstration, diesel trucks achieved 11.5 MPG, while a Tesla Semi ran 460 miles on a single charge. The study analyzed 14 Class 8 tractors, generating extensive data from 73,000 miles of freight hauling. The report challenges existing assumptions about powertrain readiness and operational efficiency. The findings indicate significant advancements in battery-electric and hydrogen technologies, while highlighting the continued importance of diesel and natural gas trucks in freight operations.

Published Mar 26, 2026

NACFE's 'Run on Less - Messy Middle' demonstration revealed diesel trucks achieving 11.5 miles per gallon, while a Tesla Semi covered 460 miles on a single charge. The study, analyzing 14 Class 8 tractors, generated 2.2 million data points from 73,000 miles of freight hauling.

AI-curated by Theia

The test included diesel, natural gas, battery-electric, and hydrogen fuel-cell vehicles. Findings indicate that despite the rise of battery-electric vehicles, diesel remains efficient, with significant fuel economy potential. The report emphasizes the need for mixed powertrains in the near term, while predicting battery-electric trucks as the future of freight transport.