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Specific example: operating a turbocharged engine on both higher octane & higher energy content fuel produces better FE because the computer and sensors allow the engine parameters to be "optimized" upward to exploit ALL the benefits of the higher energy (mpg) and octane (advanced idnition timing)...that's "gaming" the system.
Also, notice that ALL tests are done with NO electrical loads, save those during A/C tests only...but, YOU and I do drive at night, don't we?
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