xFE is another in a string of innovative, fuel saving ideas from Allison, a leader in bus transmission technology. This extra savings results from new gear ratios designed to squeeze more value from every tank of fuel.

Fuel Efficient

xFE models have been designed to deliver significantly more torque converter lock up operation and spend more time in higher ranges at lower engine speeds producing exceptional fuel savings.

Earlier Lock Up + Lower Engine Speeds = Extra Fuel Economy


We’ve designed our transmission models with xFE to lock up at lower speeds specifically for the constant shifting and lower average speeds of city and transit buses. This means lock up happens significantly earlier and buses run longer where they are most efficient.

FuelSense® Features

Through a set of proprietary software enhancements, FuelSense® 2.0 provides your fleet with an infinitely variable combination of shift points. Packages come standard with DynActive® Shifting, Neutral at Stop and Acceleration Rate Management.

DynActive® Shifting

This innovative shift scheduling uses an algorithm to choose the optimal shift point, based on your vehicle, specifications and environmental parameters, continuously delivering the ideal balance of fuel economy and performance. DynActive® Shifting enables your vehicles to operate at peak efficiency, no matter the driving conditions.

Neutral at Stop

This feature trims fuel consumption and emissions by reducing or eliminating the load on the engine when the vehicle is stopped.

Acceleration Rate Management

This feature mitigates aggressive driving by automatically controlling engine torque to one of five available levels of engagement, precisely managing vehicle acceleration to a calibrated rate.

Give your fleet the ultimate in precision, customized fuel economy and performance with FuelSense® 2.0 featuring DynActive® Shifting, Neutral at Stop and Acceleration Rate Management.


City and transit buses are the ideal application for xFE technology. The start-stop dense routes and lower average speed duty cycles present special challenges for any transmission. Allison fully automatic transmissions with xFE meet these challenges without sacrificing drivability or performance, and are compatible with alternative fuel engines. Best of all, installation of an xFE transmission is the same as a standard Allison model.

xFE Brochure

Improved Fuel Economy

xFE models can deliver up to 7% in additional fuel savings.


FuelSense® 2.0

Improve your fuel economy with advanced shifting technology.