[350 Mag]

Noticed lately my fuel economy has dropped.

After I put bigger tires and levelling kit and 1.5" lift in rear my mileage dropped by 2.5-3 l/ 100 km. This was expected.

But months later now my fuel economy has dropped again and nothing has been changed.

One day I was towing a tailer and getting 12.8 l/100 kms.

2 days later computer said 15.8-17 l/ 100 kms?

Mysterious...

 

[wreedsvt]

Winter diesel coming online in your area? Fuel filters need to be changed?

 

[Laytunes]

Yup winter diesel rolls out in Sept typically. Kerosene content of diesel is increased in the winter so the "calorie content" of the fuel goes down. As well most manufactures remove the 5% bio-diesel component which adds the majority of the lubricity. So if you don't already i'd start using a lubricity additive in the winter.

 

[hydrex]

It's not just winter diesel getting lees economy, cold weather causes longer engine warm ups and increased friction. Don't know if any Powerstroke owners use a "winter front/bra" but my Ram benefits from one when it's under 40F as well as a block heater if below freezing. Diesels are slower to warm up than gasoline. Also check tire pressure, might need to add air in winter. 1 thing that I have noticed with my Ram, regens become slightly more frequent in winter, summer I get up to 775 miles between regens, colder weather, more like 675 or even 650 miles. I'm about to turn 100,000 miles, suspect the DPF might be getting slightly filled with ash also, could contribute to more frequent regens and slightly lower mpgs.