We tell our customers to buy a tuning box for the extra power only.
We say this because the extra power is not dependent on how the car is
Fuel economy is completely dependent on how the car is driven.
To get better fuel economy when using a tuning box the driver needs to use
less total engine revolutions than they normally would. i.e. change gear
Because a tuning box increases torque low down in the rev range it gives the
car the ability to accelerate at the same rate with less RPM.
So it is possible to get better fuel economy but the driver needs to
accelerate at the same rate as they did before fitting the tuning box and
they need to change gear earlier.
At Street & Circuit we only sell tuning boxes as a device which gives more
power because that is the only thing we can guarantee i.e. that the product will
give the engine more power.