Emmissions / tax rates

[landkeeper]

I have 2 basically identical 2007 c320s both registered august 2007
Vin numbers approx 1500 apart
However emmisions stated on the v5 are different which makes one £30 a year more expensive than the other
Anybody know why this is the case ?

 

[Ron240]

It does seem unusual.
One possible explanation could be that one of the cars has been factory fitted with larger wheels and tyres which nudges it over into the next band.

 

[landkeeper]

Yes the cheaper one had 17s fitted from new , not sure about the other as its had several owners but its on 18s

 

[Tony Dyson]

Are the Euro Emissions classes identical on your Certificate of Conformity docs and the emissions listed on your V5 Docs identical?

 

[landkeeper]

Emmissions listed are different the cheaper is 193g/km the other 201g/km thats from the v5s
Variant is identical however the cheaper one is version nzaaa500 the other nzaaa511

 

[sonic]

There is your answer different emission ratings.

 

[landkeeper]

Understood but why ? is whats perplexing me
Same engine gearbox same model same month of manufacture and registration !

 

[Blobcat]

Understood but why ? is whats perplexing me
Same engine gearbox same model same month of manufacture and registration !

It is usually down to the size of wheel and tyre fitted - smaller wheels/tyres = less emissions on the CofC.

Funny thing, is that if the car was delivered on small wheels then huge alloys fitted by the dealer then the lower emissions figure would be on the CofC and it would be legal even though the emissions would no longer match those as tested...

 

[M80]

Check the VIN's and compare. They should show the wheels / tyre sizes assigned.

 

[s5tuart]

It is usually down to the size of wheel and tyre fitted - smaller wheels/tyres = less emissions on the CofC.

Funny thing, is that if the car was delivered on small wheels then huge alloys fitted by the dealer then the lower emissions figure would be on the CofC and it would be legal even though the emissions would no longer match those as tested...

That's odd!
I'd have thought a bigger rolling circumference would have lower emissions due to less engine revs to travel the same distance?
I can't get my poor old brain around that one

 

[V6Matty]

That's odd!
I'd have thought a bigger rolling circumference would have lower emissions due to less engine revs to travel the same distance?
I can't get my poor old brain around that one

Bigger wheels normally also means wider tyres, therefore larger contact patch and rolling resistance

 

[Blobcat]

That's odd!
I'd have thought a bigger rolling circumference would have lower emissions due to less engine revs to travel the same distance?
I can't get my poor old brain around that one

Normally the circumference is the same, they’re just wider with much smaller sidewalls.
This gives higher rolling resistance and higher emissions