I got 215/45/17 on mine an get 2800 at 70, but it says higher than actual, it says 70 but when i grt clocked by radars on the street i really goin 66

 

are you guys reprogrammongwith tire size increases. how do you know if your speedo is correct

 

28-2900 at 77. 3k at 80.

 

lol. I have the correct oem tires and my speedo is off by 3mph per gps. I've tested that on several gps devices too.

 

Same here, i have oem tires and am off by 3-4 mph

 

2900 @ 80mph 3.5 rfd 6mt

 

The gas mileagae goes to **** anything about 65mph for me. So now I just set my cruise around 62mph and just listen to music (a great way to not get a speeding ticlet I guess)

 

Sorry guys. My email notification wasnt working, good thing I checked back. My tire size is 225/45/18's. Just started driving like 60 miles to work and started noticing the rpm's were sucking the gas and the prices are going up so you start paying attention to eveything at that point. lol. i have been doing the same..hitting the cruise at 60 mph..but Its SO SLOOOW. I think we need a better OD gear if you ask me. Thanks for all of your help. Jet

 

I figure I bought it for fun, among other things, screw mileage.

 

Not sure how the G measures speed, but if it's measured from the transmission, going with taller or shorter tires won't change the correlation between RPM and speed on your tach and speedometer. However, changing tire size will have an impact on your actual speed vs. your indicated speed.

That said, my 06 AT cruises at 2800@70, and 3400@80.

 

I would say screw the milage to if I were just driven my G. But if you see my signature below that =$600-$1000 a month in gas!!

 

2005 G sedan 6MT, 235/45/R18 2970rpm @ 80mph

 

Sorry meant 215/55/17, 2800 at 70 but gps says 67

 

for those who are going 80 at 3k RPM. do you have 6 speed?

 

Thats kind of wierd... So our cars are all off by the same amount...? A couple years ago I mentioned that to the dealer and the guy just shrugged it off as that the speedo is allowed to be off by a certain amount and didn't want to try to recalibrate it..