question about speed and rpm with bigger tires
hey. i just purchased another JKU, its a Sahara, 2007, mexican. i drove about 700 miles from where i picked it to where i live.
most of the time it was a flat, long desert highway, with very light traffic, basically empty. so i adjusted the cruise control to 80 mph, and i noticed the tachometer was a little under 2500 rpm. i also tried going at 70 mph and the tacho was just over 2000 rpm.
now, the jeep has 285/70 R 17 BF Goodrich Mud terrains, almost new, so they have a lot of live (and weight) on them.
and i checked the speed with my cell phone gps and it was within 1 mile of what the speedmeter said.
all of this made me wonder, did the PO had something adjusted on the computer?? i know i can check if the jeep is regeared by lifting a tire and counting how many times it turns and how many times does the driveshaft turns... but how can i check if they did something with the computer??
i averaged about 16 MPG....
2007 JKU, 2.5" Rock Krawler lift, 285/70 17 mud terrains....