Just returned from a week in sunny Cornwall.
Staffordshire to Cornwall, 300 miles at a steady 70mph with about 30mins stop/start traffic jam and my new sport averaged 42.8mpg, and that was with a bike rack fitted.
Journey back at between 85/90mph and averaged 33mpg, pretty impressed.

Also I could not here any noises come from the tyres at any motorway speeds.

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Hi Simonst
I was in Bude last week with our new RRS HSE, which we had only just picked up from the dealer in Taunton on the Saturday. We too saw good MPG and similar to your 42 and have not seen it drop below 38mpg for the first tank full. On the second tank full we still got over 40mpg, but will do a real test of cost to fill and miles it does at some point in the future. Our previous RRS SDV6 at best did 36 with an average of 32-33mpg bases on the trip computer, therefore very happy with the new cars figures.
I cannot believe how different the 2 cars are, I thought our MY12 was great, but this one is in another league.
How are you liking your sport?

I am lucky to get 14mpg in my 4.2 SC but I still have the grin factor every time I drive It  2006 RRS SC Bonatti Grey (the 55th car/van I have owned)
2005 GSX 1400 K5

Wow, they really are impressive figures.

Remarkable. The other weekend I did a 350-mile round trip. Going I had a set of four heavy wheels in the back so had to accelerate and brake softly to stop them slamming into the car or each other. Didn't hang about once travelling though, and returned 24 mpg. On the way back it was back to the usual 18. 

The car is amazing, I came from a 2006 HSE which I had from new and the most mpg I ever saw was 33mpg, but usually about 28 mpg on a long motorway run.

One of the biggest surprises is the way it picks up speed and how quick the gearbox is at shifting down, the 2.7TD really was slow on both fronts. 2014 Nara Bronze SDV6
GONE TDV6 HSE RRS in Giverny green,Ebony interior, Side steps,Tints, PTI, Tow pack, mud flaps, Side strips and Dynamics pack.

Hi Simon. What wheels/tyres are you running, please?

Thanks. MY14 RRS2, Corris, Pano, 50/50 Cirrus/Black leather, Meridien sound, 22" Style 6's, Bespoke Gap around tailgate.
Porsche 911 (just left!)
1972 VW Bay Camper (cooled by the air alone!!)

Ha ! Gal . . . . you Sexy Beast !

should have picked this one though !

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Oh, yeah......thanks, B3EE. I'm beautiful in that one. Who'd want to give this up, eh...?

Now eat your sausage!! MY14 RRS2, Corris, Pano, 50/50 Cirrus/Black leather, Meridien sound, 22" Style 6's, Bespoke Gap around tailgate.
Porsche 911 (just left!)
1972 VW Bay Camper (cooled by the air alone!!)

I'm running 22's with the std m+s conti's. 2014 Nara Bronze SDV6
GONE TDV6 HSE RRS in Giverny green,Ebony interior, Side steps,Tints, PTI, Tow pack, mud flaps, Side strips and Dynamics pack.

Thanks Simon. What pressures are you running?

And what does M&S stand for? I'm guessing g that it's not Marks & Spencer.
Thanks. MY14 RRS2, Corris, Pano, 50/50 Cirrus/Black leather, Meridien sound, 22" Style 6's, Bespoke Gap around tailgate.
Porsche 911 (just left!)
1972 VW Bay Camper (cooled by the air alone!!)

Mud and Snow?

My HSE is getting around 37mpg with 1500 miles on the clock. I'm pleased with that, Arrived: MY16 A/B SDV6 in Aruba, Ivory interior, piano black trim, black panoramic roof, spare wheel, blind spot monitoring, mudlaps and more...

Gone but not forgotten:
2014 RRS2 SDV6 HSE in Loire Blue
2011 Freelander 2 SD4 HSE in Santorini Black

Just got back from north wales we go most weekends round trip of 300 miles when we got the be with 10 miles on clock ( pre reg ) in sept the mpg was around 24 now with 6000 on and with bike rack on with two bikes mix of motorway and a roads we are getting 32 plus looking forward to 2014/5 hse in Mariana due mid July

i think you all need to check a real fill up on the tank do not look at the lie-o-meter it's miles out i am afraid 2014 5.0SC AB

Gone 5.0 SC

Yes, a real fill up and a GPS tracker to measure distances, odometers are inaccurate too... Mark

SVR in Estoril Blue