I noticed at 80mph cruising I'm at 3250 rpm's. Is that about right?

 

Dang I have 4.11's in my car and when I am doing 80mph my rpm's are at 2,600. But I have a 6-speed though.

 

That sounds about right

 

I have 3.73s in a six speed and at 80 im like...around 3grand

 

You can calculate speed and RPM here:
http://www.f-body.org/gears/

 

Kinda hurts the ol gas milage dont it

 

Put your car in it's 1:1 ratio gear (3rd in autos, 4th in manuals)....drive at 70 mph. Your RPM will tell you your axle ratio.

 

I'm missing to much info to get a correct reading when I try to use the calculators online. That's why I was trying to see where others with A4's and 4.10's are at in the rpm range at a certain mph.

 

Gas prices is the last thing I worry about in the middle east.

 

I thought it was 3rd gear with the tq converter locked up or something?

 

3250 seems a little high? But then again, you've got a 3500 stall converter ..... that's probably the cause. Mine would cruise right around the ~3k mark at ~80 mph.

Gas mileage wise? Well, to be honest, I put back the 2.73's this summer because I've been doing a lot of highway driving (and not much racing) but I really haven't been getting very good mileage anyways, and can't honestly say that my fuel consumption (on average, with a ~50/50 mix of city/hwy) has changed very much one way or another. Sure, 100% straight highway cruising, I can get a little over ~300 miles to a tank, but even with 4.10's, I could get around ~240 or so ... still not bad.

 

What info are you missing? I have a similar version of that calculator in my sig.
All you have to do is enter the vehicle and change the gear ratio to 4.10, if you have changed the tire size then enter it, if they are factory then it will auto populate then you just need to press calculate.

When the results come up on the screen to the right, then you go to the 4th gear column scroll down untill you see 80 then look over and see what RPM the math says the motor should be rotating at. BTW, with stock tires and 4.10's you should be closer to 3000 RPM's, to get higher then 3200 you need tires smaller then 24' tall... BTW, is your speedo reading correctly?


*** EDIT ***
This does not account for an unlocked converter, but the converter should be locked at that speed...

 

I don't know what you would be missing.

Allow for tach error, too.