You won't get 70mpg from that. The manufacturer stated combined figure is 62mpg, and even then you'll be lucky to get near that.
Also, it seems odd to be spending ~£20k on a new car and stating it's primary benefits as mpg and low tax.

What a fantastic looking car!
That looks amazing!
So you want a Camaro or a Mazda 6 because of cheap tax and good MPG? Does not add up...

Oh come on. It's not bad looking but it's not that interesting either.
It's not aggressive, nor beautifully styled, just middle of the road inoffensive saloon styling.
Not seen the inside - might be better.
Oh come on. It's not bad looking but it's not that interesting either.
It's not aggressive, nor beautifully styled, just middle of the road inoffensive saloon styling.
Not seen the inside - might be better.
Reminds me a bit of an insignia which I got bored of pretty quickly.

So you want a Camaro or a Mazda 6 because of cheap tax and good MPG? Does not add up...

Oh come on. It's not bad looking but it's not that interesting either.
It's not aggressive, nor beautifully styled, just middle of the road inoffensive saloon styling.
Not seen the inside - might be better.
Reminds me a bit of an insignia which I got bored of pretty quickly.