My wife's car is a Leon tdi sport, I've noticed that the fuel enconomy on a long motorway drive isn't the best, returns about 40 mpg. That's driving at about 75 if I drop down to about 65 it goes up to about 50mpg
I think this is because the turbo kicks in when I'm doing over 65
What I'm wondering is, if I went up or down (I think it's up a size) then that will increase my speed at lower revs?
Is this correct?
Currently it has 205 55 16 and I was thinking of 205 60 16

Any opinions/advice welcome

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Cherry rallye - DOB Thursday 29/04/1999
Team Rallye - the leaner, meaner, better looking sister of the GTI6

The best engine in the world is the vagina, it takes any size piston, its self lubricating, starts with 1 finger, and every 4 weeks does its own oil change. It's just a pity the management system is so fecking temperamental. 

I doubt it would make much difference to be honest I'd be happy with 40 to 50 mpg all day long

Ok it's just something somebody said to me
If the bloody thing had a 6th gear it'd be brilliant

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Cherry rallye - DOB Thursday 29/04/1999
Team Rallye - the leaner, meaner, better looking sister of the GTI6

The best engine in the world is the vagina, it takes any size piston, its self lubricating, starts with 1 finger, and every 4 weeks does its own oil change. It's just a pity the management system is so fecking temperamental. 

However to force yourself through the air faster you'll use more fuel regardless.

Leave it on the right size - is it worth it?

Poof

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Ph3 China blue GTi-6 330Ci///M Sport & NC23 CBR400RR

You feed beefburgers to swans.

I may have been speeding Mr Policeman but [a] I live for the 306 and [b] did you see that dog? omfg

Shocker as sports diesel does not do 70 mpg like the salesman said it would.

Check and double check tyre pressures. Run them at the max recommended amount, i'd imagine about 33psi ish?

My old 406 hdi daily was easily 5mpg better when i ran tyres at 33psi. Book figure was 29 i think.

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1999 Astor Grey GTi-6 OEM+ (now gone...)
2004 Aegean Blue 206 GTi 180 (also gone...)
2006 Skoda Fabia vRS in Sprint Yellow