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Gearheads
An interesting upgrade for some older vehicles.
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<blockquote data-quote="tRidiot" data-source="post: 3081408" data-attributes="member: 9374"><p>I'm running 275/60r20 right now. Stock size is actually 265/70r16.</p><p></p><p>However... I am pretty sure I had my tire size reprogrammed a few years back... when I first put on 20" wheels. </p><p></p><p>An online calculator tells me at 65mph on my speedometer, I should be doing a hair over 70mph actual. This is based on stock, but using GPS on my phone as well as my stereo headunit, this isn't quite right. I actually set the cruise at about 67 to ride at 70. This correlates well with plugging in a 285/50r20 as the original tire, which is what I was running before the lift. So I am assuming that I had the programmer change the tire size at the time. I was having him activate the pin switch for electric fans on my 2004, which weren't factory until 2005.</p><p></p><p>With those numbers, I should be off by about 4.7%, I believe, which would correct for a mileage of ~15.2mpg, from a reading of 14.5mpg at the dash. However, I know from previous experience that the reading at the dash isn't all that accurate, either. I think the last time I calculated it, it was showing something like 18+mpg, and I calculated based on mileage driven at somewhere in the low 17s. This was unscientific, of course, as it was calculated from full tank to full tank, simply using the pump at fillup to fill as high as possible. But it was a rough guesstimate. I should do that this week, try to calculate actual mileage, since 99% of my driving is pure highway.</p></blockquote><p></p>
[QUOTE="tRidiot, post: 3081408, member: 9374"] I'm running 275/60r20 right now. Stock size is actually 265/70r16. However... I am pretty sure I had my tire size reprogrammed a few years back... when I first put on 20" wheels. An online calculator tells me at 65mph on my speedometer, I should be doing a hair over 70mph actual. This is based on stock, but using GPS on my phone as well as my stereo headunit, this isn't quite right. I actually set the cruise at about 67 to ride at 70. This correlates well with plugging in a 285/50r20 as the original tire, which is what I was running before the lift. So I am assuming that I had the programmer change the tire size at the time. I was having him activate the pin switch for electric fans on my 2004, which weren't factory until 2005. With those numbers, I should be off by about 4.7%, I believe, which would correct for a mileage of ~15.2mpg, from a reading of 14.5mpg at the dash. However, I know from previous experience that the reading at the dash isn't all that accurate, either. I think the last time I calculated it, it was showing something like 18+mpg, and I calculated based on mileage driven at somewhere in the low 17s. This was unscientific, of course, as it was calculated from full tank to full tank, simply using the pump at fillup to fill as high as possible. But it was a rough guesstimate. I should do that this week, try to calculate actual mileage, since 99% of my driving is pure highway. [/QUOTE]
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