i do a lot of motorway miles and wondered what is the optimum cruise control speed is for the best MPG?

i have TDV6 is that makes a difference.

Thanks You can live in your car but you cant race your house
just put white indicatrs on, have all black badges ready and have quote for rear tints and dvd's

56mph  RRS gone
Audi SQ5...Gone Audi Q7 S-Line 240 3.0TDI Gone
Audi A6 Allroad Sport 270 3.0TDI

I actually tried this out in mine back when i had mine.
I managed to get this, see below, and i was sitting at between 60-70 the whole time.


Was avoiding filling it up obviously!

I found it makes quite a difference sitting behind a lorry, as it creates a slip stream. That's where adaptive cruise is good as it keeps the set distance. I've managed to get higher 30s like that. WINNER - 2009 ‘Just Doing What It’s Designed To Do’ Award

2010 TDV8 HSE Galway Green - Adaptive Cruise - Sunroof - Privacy Glass - 5 Spoke Alloys
2009 TDV6 3.0 HSE Buckingham Blue - GONE

No idea if this is true of the RRS as I have only had mine for 24 hours. However, evey car that I have ever owned has been about 1-2mpg more efficient by turning cruise controll off and doing it the old fasioned way.

Isn't it due to the constant braking and accelerating trying to maintain a set speed?

anyone4apint wrote:

No idea if this is true of the RRS as I have only had mine for 24 hours. However, evey car that I have ever owned has been about 1-2mpg more efficient by turning cruise controll off and doing it the old fasioned way.

My indicated mpg over the first 1000 miles all on A, B and single track roads shows 27.7 mpg. Not too bad I thought considering a new tight engine and no long motorway trips.

Read a great tip on hear the other day. When on the motorway sitting at 65-70 Manually select 6th then go back to automatic. It may be that you are running in auto in 5th at high revs and the speed is just below where the box would automatically select 6th gear. Selecting 6th yourself then back to auto, the box will stay in 6th gear = lower revs = fuel savings.

Pretty obvious really, but I never thought of it in the year i've had the RRS. Been trying this for the past couple of days and showing approx 5 MPG better on the display than I normally get. This is with 80 motorway miles a day sitting at around 70 - 80.  RRS TDV8 (loving it)
Suzuki Bandit 1200 (For when the suns out)
Nissan 350z GONE

55 is ok if using tiptronic mamual selection as you can select 6th gear manually.

Normally auto box usually does not engage 6th gear until 60 mph so best to be doing just over 60 in normal auto box to get the lower gearing.

I find 50 mph is best for mpg but am aware of looking like a road block so tend to settle for 55 mph which appears a bit more acceptable to other road users....

My TDV8 changes into 6th at 50mph without the need to force it with manual selection?

as long as rpm's are over 1,500 it'll change up if light footed RRS gone
Audi SQ5...Gone Audi Q7 S-Line 240 3.0TDI Gone
Audi A6 Allroad Sport 270 3.0TDI

L888DER wrote:

i do a lot of motorway miles and wondered what is the optimum cruise control speed is for the best MPG?

i have TDV6 is that makes a difference.

Thanks

My TDV8 was on 12 when I picked it up

130 miles later (at errhemm 80 something plus a few all the way) it was up to 19

So to maintain 17 requires a pretty heavy foot!

Ahhh I seeee supercharged hmmm  RRS gone
Audi SQ5...Gone Audi Q7 S-Line 240 3.0TDI Gone
Audi A6 Allroad Sport 270 3.0TDI

Ha!

12 is impressive.

terrifying more like

I put £60 in it and it went from zero (yes it was truly was empty when I took delivery) to 130 miles of range... almost had a heart attack...  RRS gone
Audi SQ5...Gone Audi Q7 S-Line 240 3.0TDI Gone
Audi A6 Allroad Sport 270 3.0TDI