My Mercury Milan Hybrid is gradually getting poorer and poorer mileage. Over the years it has gone from 38-39 MPG down to 32-33. I have replaced the spark plugs and the air filter with no change in the MPG. Any idea why?

Does this dip in fuel economy seem to correlate to cold weather? If so, that’s expected. How often do you check your tire pressure?

There was some talk about a built in 10 year timer on Ford hybrids that limits the electric operation of the powertrain after a ten year period. It doesn’t disabled the hybrid part of the powertrain, but after ten years the electric motor is used less, supposedly this was done to prolong the life of…

Here’s that discussion: [image] 2010 Ford Fusion Hybrid electrical motor comes on less; mileage dropped Maintenance/Repairs @Fins2l2r_154900 - Do you have any links that discuss this timer issue? I have a 2011 MKZ hybrid, wondering if it applies to it. My '11 MKZ hyb…

I did some googling, found this solution, which I have NOT tried, so no guarantees! [image] My instructions on restoring the hybrid EV function on the Ford Fusion Hybrid... So youre getting pissed off at the Hybrid function, not working correctly anymore as it once used to, or very rare …

I read about 2 pages of the comments on that Ford Fusion Forum There was a guy with a 2010 Fusion Hybrid with 300K that performed the “reset” procedure, and he reported a dramatic increase in fuel economy. I kind of wonder how long his battery will last, given that the control module(s) are now un…

As far as I know Toyota doesn’t resort to this, their batteries last fine. I’d rather get full benefits, then deal with the battery issue if it comes up.

For unexplained reduced mpg the first check is to make sure the gasoline engine is reaching normal operating temperature. Faulty coolant thermostats that cause the engine to run too cool is the most common cause for this problem. Is it still the original thermostat?

The change has taken place over 10 years and doesn’t seem to have anything to do with the tires

The tire pressure is checked every time I have the car serviced. The drop has occurred over 10 years time and is not temperature related. Plus, I live in the SF Bay area and we don’t have big temperature changes in the winter.

[image] George_San_Jose1: For unexplained reduced mpg the first check is to make sure the gasoline engine is reaching normal operating temperature. Faulty coolant thermostats that cause the engine to run too cool is the most common cause for this problem. Is it still the original thermostat? I…

2010 Mercury Milan Hybrid - MPG going down

Maintenance/Repairs

jtsanders February 25, 2020, 10:37pm 14

Is the hybrid battery degrading? You may need to replace some of the cells in the hybrid battery. You need a qualified shop to test the battery.

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2010 Mercury Milan Hybrid - MPG going down

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