Volvo XC90: Starting and driving / Activating and deactivating Eco drive mode using the function button
There is a function button for Eco drive mode in the center display's Function
view if the vehicle is not equipped with a drive mode control in the tunnel console.
When the engine is switched off, Eco mode is deactivated and must therefore be
reactivated each time the engine is started. ECO will be displayed in the
instrument panel when the function is activated.
Selecting Eco drive mode in the center display's Function view
Tap the Driving Mode ECO button to activate or deactivate the function.

An indicator light in the button will illuminate when the function is activated.
Eco drive mode can help make driving more fuel-efficient and eco-friendly.
Use this mode to save fuel and promote ecofriendly driving.
When Eco mode is activated, the following characteristics are modified:
The automatic transmission's shifting points...
Start/Stop is a function that temporarily switches off the engine when the
vehicle has stopped, e.g. at a traffic light or in heavy traffic, and then starts
it again automatically when needed...
Other information:
Apps can be updated when the vehicle is connected to the Internet.
NOTE
Data downloading can affect other services such as transfer data, e.g.
web radio. If the affect on other services is experienced as problematic, the download
can be interrupted...
City Safety1 can assist the driver when turning into the path of
an oncoming vehicle in an intersection.
Sector in which City Safety can
detect an oncoming vehicle in crossing traffic.
In order for City Safety to detect an oncoming vehicle in situations where there
is a risk of a collision, that vehicle must be within the sector in which City Safety
can analyze the situation...