Transmission Fluid/Filter change = more MPG?

[MarkEagleUSA]

I've had my '03 for 3-1/2 years. It has NEVER gotten better than 15.3 MPG on the lie-o-meter in the console. Two weeks ago I changed the transmission fluid & filter, and adjusted the bands per the FSM. I also drained & filled the diff's. With about 300 miles since the service the lie-o-meter is reading 18.4!

I'll do a manual calculation the next time I fill up but I'm wondering if a transmission service can have that kind of impact on the MPG? I've never experienced this in any other vehicle I've owned. I will say the transmission seems to be much more responsive and smooth... maybe that's why?

 

[Darkbloodmon]

I've had my '03 for 3-1/2 years. It has NEVER gotten better than 15.3 MPG on the lie-o-meter in the console. Two weeks ago I changed the transmission fluid & filter, and adjusted the bands per the FSM. I also drained & filled the diff's. With about 300 miles since the service the lie-o-meter is reading 18.4!

I'll do a manual calculation the next time I fill up but I'm wondering if a transmission service can have that kind of impact on the MPG? I've never experienced this in any other vehicle I've owned. I will say the transmission seems to be much more responsive and smooth... maybe that's why?

How many miles on the truck? Do you have any previous records of drain and fill maintenance?

 

[AH64ID]

Do you have a trans temp gauge?

 

[gsbrockman]

I’d be more inclined to hold suspect the weight of the axle fluid in the differentials prior to change....not the transmission servicing.