Hello to all,

I current drive a 2009 Ford F150, 4 door supercrew 4x4 and live in Ontario. During the summer I had 245/75/17 10 ply tires on and was getting 11L / 100 kms sometimes as low as 10L / 100kms. I recently installed 265/70/17 and it is now winter here, my mileage sucks at 14L / 100km now.

1) Question....is it the tire size making the difference, or winter driving???? my vehicle is inside in a garage during evenings, so there is no idle time.
2) how can I increase my mileage
3) should I install a chip?

Cheers

 

The change in your tire size would have a minimal impact on your mileage. Simply put, it's a combination of winter gas and colder temperatures. A tuner isn't going to give you back your summer mileage.

 

Hi & welcome.

Determine what ( if any) the diameter difference is between the 2 tires - as that will throw off yer odo/speedo and hence affect any mileage calculations.

The differences in the tire itself - tread, rubber compound, inflation, width, weight, etc - can affect rolling resistance and dynamic rotating inertia.

Winter fuel blends are notorious for reducing mileage.

Even if garage-kept, enrichment will occur for a longer period of time than in summer.

And in general - colder temps cause increases in frictional losses almost everywhere in the drivetrain


MGD

 

Mostly just cold weather and winter blend fuel. The tires may have made a slight difference. But the difference in diameter between the 2 tires is only 0.14"

 

yeah winter fuel sucks. mine always goes way down in the winter.

 

Tire size can have an impact especially if your rolling circumference is different. My winter tires have a smaller circumference then my all seasons so the truck thinks its going about 5% further then it actually is. This throws off your trip computer and your hand calculations. Also colder weather will impact your mileage as well as driving over snowy roads. The more snow the more rolling resistance which means the more fuel your engine burns moving the truck.

I get between 11-12 L/100km in the summer and I average about 14L/100km during the winter as well so your in the ball park.