Just locate a measured mile somewhere or toss in a 3rd party gps that will report mph. I am lucky that I happen to know where a measured mile is located on a semi-back road that the county/township uses specifically for vehicle calibrations. Has a sign and a big white stripe at the beginning and end so you know positively when you've hit it.NVSteve wrote: Is it via the driveshaft, wheel rotation, or what? If I go with larger tires, I would really like to be able to calculate my true mileage, which I can then use to also get true MPG. Yes, I'm anal.
Do you remember which of the Geolanders you had? I think I've seen at least 3 different models, but the two I have in the attached photo were the ones that seemed to be most suited to wet/dry/snow.phantom2 wrote:I've had Geolandars on another vehicle and I found them to be an excellent all weather tire.
I'm good with the MPH calculation because each tire mfr. publishes the revolutions per mile, which I can calculate against my stock revs (supposedly accurate with the speedo) to get MPH. I'm more concerned with actual mileage readings. If it's based on wheel rotation, then it's a piece of cake to calculate. If it's something else, then I'll have to do something like you suggested. It isn't a huge issue with me, as I'll still be able to tell if my mileage is better or worse at any given time, but it would still be nice to have real numbers to work with-assuming I even go with larger tires. The 285's will only give me 1/2" more of additional clearance, and just under 1" in width. The added clearance is the only thing that I'm concentrating on. I keep flip-flopping with my decision. If there was no rubbing involved, it would be a no brainer for the 285s.blink32 wrote: Just locate a measured mile somewhere or toss in a 3rd party gps that will report mph. I am lucky that I happen to know where a measured mile is located on a semi-back road that the county/township uses specifically for vehicle calibrations. Has a sign and a big white stripe at the beginning and end so you know positively when you've hit it.
I took the path on that road a few times with a stop watch and recorded my numbers at different speeds. Popped in the Nuvi 660 on a few trips and compared speedo w/the garmin read out. Crunched the numbers and came up with the effect mph at a given speed. I think I came up with 7% slow or something like that if I remember right. I just know @ 60-61 I'm traveling 65mph. The best you are going to end up with is an average of averages without being able to reprogram the ecm for the over-sized tires. Then you can multiply your mileage by the % and end up with the "as close as possible to real" mpg. This is what I used to get my 20.2mpg result on a trip up to CT. Otherwise it was a semi-dismal 18.8.
I'm not sure. I've always them OWL in the past, but the black would make for a cleaner look. We'll see when the time comes.Fofiddy wrote:Are you going white letter or Black wall?