Standard, Run a tank through, test MPG, do the opposite, run a tank through. Same normal driving around town, with no long trips. We did the testing on our previous 15. Now we have a 17.
I record and calculate MPG for every tank. So it was easy to see that 4A hurt the MPG, both the tank before and after were 1.5 MPG higher.
Our 4WD system itself has ZERO torque modulating capability other than engaging the front driveshaft and locking the hubs. It is either on or off. It is basically the same basic system as the F-150. It can use the brakes to assist torque distribution from side to side, Example, brake the wheel that is spinning to send power to the wheel that Isn’t, because the front Diff is open. The rear can be a limited slip if it has the appropriate option pack. If the front drive shaft is engaged, 50% of torque is going forward. There are no clutch packs to vary the torque distribution in our trucks.
The AvanceTrac system does a real good job in the Expy at using the brakes and modulating power to keep the vehicle moving. Driving in slippery snow, I can feel and hear the system working.
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