I can go 300-350 miles on a tank mixed driving, on they hwy I pulled close to 450.
I count days between fillups rather than mpg. If I can go 2 weeks without filling up I'm doing pretty good.
That's only a 0.08" difference between those tires. The change it would make in the speedometer reading is less than 0.5%. No speedometer gear is going to correct for that small a change. Most people are happy to have a speedometer that is within 5% accuracy.My speedo is way off and it makes me mad everytime I drive it.lol I'm going to do what it takes to fix it(I dont know what that is though). Ive got the correct "speedo gear" for 3.55's but my tires now are 25.66 tall while the stock ones where 25.74.
Are you sure you have the correct speedometer gear?
ot but what speedo gear do you need for 3.73 gears?
If you have the wrong speedo gear, you speedometer will be off by a percentage, not by a specific number of MPH. Thus, the higher the speed, the more miles per hour it will be off. If your speedo is consistently off by a specifice MPH throughout its range, you have another problem that a new speedo gear won't fix .Based on the chart where I bought it I do. What gear should I need with 3.55 gears? I think my speedo is like 5-8mph off, lol.I'll verify that in the next few days, but I believe thats what I remember it being.
That was the point... It's NOT what your trip odometer says, it has to be your ACTUAL miles traveled (odometer reading corrected for error).Mileage = # of miles driven, divided by # of gallons put in to fill up.
Example: if your trip odometer says you went 150 miles, and you put in 7.5 gallons, then you got 20 MPG.
Didn't any of y'all pay attention in your freshman year math class in high school?
If you have the wrong speedo gear, you speedometer will be off by a percentage, not by a specific number of MPH. Thus, the higher the speed, the more miles per hour it will be off. If your speedo is consistently off by a specifice MPH throughout its range, you have another problem that a new speedo gear won't fix .
To figure out what speedometer driven gear you need, use this formula:
20.168114 / Tire Height X Axle Ratio X # of Drive Gear Teeth = # of Driven Gear Teeth
EXAMPLE: 20.168114 / 26" X 3.55 X 7 = 19.28 (19-tooth gear)
Since most tires will actually be a little smaller than their theoretical height, it's possible that you may need to get a driven gear with one more tooth than this formula or a speedometer gear calculator tells you you need. It's rare that you'll find a speedo gear/differential gear/tire size combination that will give you 0% error. The idea is to get the error as low as possible.
With a 1992 AOD or 5-speed, a 23-tooth gear will give you about a -3% error -- which is pretty good. A 22-tooth gear (unfortunately, nonexistent) would give you a 1.5% error.Based on this calculator, with a 23 tooth gear(which I have) my speedo will be off by -3%.
http://crt-performance.com/speedometers.htm
-Dave
How do you know your truck's speedo is correct? A vehicle's speedometer is allowed to be up to 10% too fast (it must not read too slow) from the factory.I'll have to get someone to drive my truck and pace me to see how much my speedo is off. I believe it reads faster than im actually going, I havent drove the car much in the last year.
How do you know your truck's speedo is correct? A vehicle's speedometer is allowed to be up to 10% too fast (it must not read too slow) from the factory.
The best method is to compare mile markers to the trip odometer. Go at least 10 miles.
What's gas milage?
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