For probably the last 25 years or so, many/most fuel injected cars will entirely shut off fuel delivery when coasting in gear at higher speeds. At those moments, your fuel economy is practically infinite as no fuel is being used, and your gauge should show the maximum economy it can.
ICE displaying 100+ mpg?
I drive an ICE (gasoline) smart car. In stop-and-go city driving under 45 miles per hour, the vehicle's display is hitting 100+ mpg at times throughout the city drive. How does the smart calculate the 100+ mpg? Does the spike occur when I remove my foot from the gas pedal upon approaching a red light? I put the 5-speed manual transmission into neutral for only about the last 20 feet or so before the stop.
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