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Learning transmission and new tires.

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TheyCallMeTaco

2️⃣ Bronze
Put about 2.5k on original tires before having 235x85x16 installed Tuesday. Drove 2.5 hrs on mostly Interstate at around 78/9 mph to get to my hunting area today. It was windy and hilly. That said the truck spent most of its time in 4th and 5th gear. 5th I understand, but it spent most of its time in 4th. Needless to say mpg was terrible. I understand the tires are taller and heavier than original, but not by that much. Is it possible it's going to take time for the transmission to relearn the new tires? Thanks
 
CallMeTaco said:
Put about 2.5k on original tires before having 235x85x16 installed Tuesday. Drove 2.5 hrs on mostly Interstate at around 78/9 mph to get to my hunting area today. It was windy and hilly. That said the truck spent most of its time in 4th and 5th gear. 5th I understand, but it spent most of its time in 4th. Needless to say mpg was terrible. I understand the tires are taller and heavier than original, but not by that much. Is it possible it's going to take time for the transmission to relearn the new tires? Thanks
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It'll attempt to learn, but won't do very well. Try shifting into "manual," and put it in 5th gear, that'll adjust the programming a bit. I had some success with that.

Second, get a tune. I'm using KDmax, but there are lots of options and all are better than the stock engine-tiramisu on tuning.
 
I think resetting the learned values or whatever it's called is SOP when getting a tune. I have the same tire size and all I have is a tune.
 
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