Thread: D4 the size question

Originally Posted by Turtle60

I run 265/65/18 and Speedo is bang on 100 when IÂ’m doing 100. IÂ’ve measured this on 3 different GPS devices.
Your measurements ( Maths) donÂ’t lie
cheers Steve

Did you change your odometer settings with an iiD or something similar?

Originally Posted by ramblingboy42

if you just compensate yourself on most vehicles these days you are indicating around 106 for a true 100.

the noddies religiously sitting on 100 in their coocoons are only really doing around 94-5 and if they're being cautious even less.

.

I drive using 'actual' speed,from the Garmin in both our vehicles.That does, of course, depend on conditions.

It certainly gets frustrating at times.

Many interstate truck drivers sit on 105km/hr,actual,in a 100 zone,so are actually doing around 9 to 10km/h faster than someone sitting on 100km/hr as per their speedo.

The ones that go faster usually have the diff ratio in the ECU 'calibrated'..

Originally Posted by John_D4

Did you change your odometer settings with an iiD or something similar?

No need to as everything is how it should be. Interestingly now the argument comes up about fuel economy but when considering that the speedo was out by 6% that actually makes the fuel economy appear better the it is (6%). If you figure your getting 10lt per 100k. Your not actually getting that your getting 94-96ks for the same 10lts. Small point but it’s been said that oversize tyres decrease fuel economy than taking account the above I don’t think it’s the great a difference at all.

Originally Posted by Turtle60

No need to as everything is how it should be. Interestingly now the argument comes up about fuel economy but when considering that the speedo was out by 6% that actually makes the fuel economy appear better the it is (6%). If you figure your getting 10lt per 100k. Your not actually getting that your getting 94-96ks for the same 10lts. Small point but it’s been said that oversize tyres decrease fuel economy than taking account the above I don’t think it’s the great a difference at all.

Not quite. With the speedo out (factory) the odometer is actually close to spot on.

With 265/65-18 the speedo squares up and the odometer goes out 5%.

It can all be corrected.

All interesting points. I think I’ll go for 265/65/18 when the tyres are due for changing this year. I’m not loving the Maxxis 980’s at all and I’ve been planning on buying an iiD anyway.

I pretty much ignore the lt/100km reading. It’s never right. I’ve got an excel spreadsheet that I use for fuel tracking.

Another curious thought... with a factory alloy bullbar will I still be able to drive through a car park in access mode?

Originally Posted by John_D4

All interesting points. I think I’ll go for 265/65/18 when the tyres are due for changing this year. I’m not loving the Maxxis 980’s at all and I’ve been planning on buying an iiD anyway.

I pretty much ignore the lt/100km reading. It’s never right. I’ve got an excel spreadsheet that I use for fuel tracking.

Have you tried one of the smart phone apps? I use FillUp and it is great. You just enter the data when you add fuel and it does all the calculations for you and maintains a database so you can look back. You can also record where you filled up.

Cheers
Numb Thumbs

Originally Posted by Numb Thumbs

Have you tried one of the smart phone apps? I use FillUp and it is great. You just enter the data when you add fuel and it does all the calculations for you and maintains a database so you can look back. You can also record where you filled up.

Cheers
Numb Thumbs

There’s some good apps.

I never worry about fuel tracking - couldn’t be bothered - I do expect a reasonably consistent burn so if the range drastically alters I do notice.

Only plan for long trips remote, beyond that I just allow a decent reserve. Fuels the cheapest part of running a vehicle as far as I’m concerned.