My LLY was pretty much stock when I got it. It had the LLY mouthpiece and all. The tires are 265s. My speedometer wasnt too far off. I hooked it up to efilive a few days ago and noticed the tire size was still set at 245. I changed it to 265 and didn't think much about it afterwards. On the way to work this morning, I noticed I have around 100 miles on the tank and the needle has barely moved. I wasn't able to check my speed with gps, but it makes me wonder if the tire size was corrected elsewhere. How can I tell? If a transmission shop or dealer changed it, wouldn't it show up on the map I downloaded?
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