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AnonTechie [soylentnews.org] writes:

Ambiguous Title Changed from Gas mileage up a gallon since early '90s to Gas mileage up a mile a gallon since early '90s

Despite advancements in fuel-saving technologies over the last 25 years, on-road fuel economy for all vehicles is up only one mile per gallon during that time.

In an update to research conducted two years ago, Michael Sivak and Brandon Schoettle of the University of Michigan Transportation Research Institute say that actual, on-road fuel economy for the entire fleet of vehicles (including cars, trucks, buses and motorcycles) has improved from 16.9 mpg in 1991 to 17.9 mpg in 2015.

"One fundamental problem with improving the average fuel economy of the on-road fleet is that improvements in fuel economy for new vehicles take a long time to substantially influence fuel economy of the entire on-road fleet," said Sivak, a research professor at UMTRI. "This is the case because it takes many years to turn over the fleet."

https://phys.org/news/2017-03-gas-mileage-gallon-early-90s.html [phys.org]

[Abstract]: On-Road Fuel Economy of Vehicles in the United States: 1923-2015 [umich.edu] [PDF]

What do you think, could it be a conspiracy by oil companies ??

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