The use of cetane improver also helps to maintain acceptable fuel mileage.
Fuel mileage with the stock chip had been a consistent 43 mpg.
The Toyota Camry 2.0 available locally runs a 1AZ-FE which is similiar, just without the D-4 direct injection and using conventional electronic fuel injection instead.
In D-4 direct injection, fuel and air is injected directly into the cylinder, instead of mixing it in the intake port which is how conventional fuel injection works.
For instance, the Turnpike Traveler page offers an interactive travel map, and a Toll/Mileage calculator.
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