Decrease in MPG by 1 point... Tires to blame?

How long is the 1 mpg drop average for? Also keep in mind you’re going from a relatively worn down tire to one with nearly an inch of tread on it too.

 

New tires can decrease mileage slightly. Deeper tread=more resistance. As they wear smooth with less tread flex and the lower the depth is when you can get your best milleage. Keep them air as hard as you can.

 

Compair revolutions per mile and adjust ecm to new tires.

 

Don't forget to rotate them every 20k to keep the feathering at bay while you deal with the new tire "squish". Aren't new tires great?!

 

Kellys are more of a farm tire IMO. Like if your hauling grain, running gravel roads, etc. So, you went from one of the best tires in the business to a mid range non OTR tire.

 

You went from a high end tire to a middle of the road high traction tire

 

Exactly. You went from a premium to a mid grade tire. Fuel economy will suffer.

 

I like and respect your content and knowledge. Higher psi is better for mpg, but decreases ride quality and wear. It is a mega fleet way of thinking. Need to really find balance that works for each individual operation. Every tire has a operation range.

I run 95 in steers, and 90 on trailes and drives. It works just fine for my operation.

 

I’ve ran a set of Kelly (8) drive’s tall rubber (11.24.5) KDA. Back then I paid $325 each brand new. It was a deal I couldn’t pass up. Had very good luck with them, but like stated above, when they start feathering, it’s time to rotate.