What's your highway fuel consumption at various speeds?

[Circlotron]

I'd like to know what sort of fuel consumption figures people get at speeds of 80, 90, 100, 110 kph for both V6 and V8, particularly V8 . My car doesn't have a trip computer so I don't know and I'm too tight to buy a tank full of petrol seeing I normally run on gas. I just wish there was a gas consumption meter too.

[Not_An_Abba_Fan]

There is a gas consumption meter, it's called mathematics.

Fill the gas tank, reset your trip meter, when you refill the gas again, take note of how many litres you put in and the k's you have done. Divide your litres by the k's and multiply by 100, this will give you your litres per hundred usage. EG: 40 litres, 350kms. 40/350 = 0.114, x 100 = 11.4 litres/100kms.

To answer your question, we get around 8.5L/100 at 80, and about 9.5L/100 at 110 in our Senator, VTII 5.7L.

[Smitty]

my SSv 6.0 manual wagon gets around 8.2-8.8l/100km at anything over 90kmh
doing 90 or 100 or 110 doesnt seem to change the fuel consumption very much...for some strange reason

[Circlotron]

There is a gas consumption meter, it's called mathematics.

On that basis I get around 15.5 mpg around town or 18.22 l/100km on gas but that's over the whole tank, not from moment not moment or at various speeds. I'm going from Dandenong to Ballarat and back on Saturday so I'll see how that goes. First halfway decent trip in the car so far.

[Not_An_Abba_Fan]

Fit a vacuum guage and try to keep the vacuum as low as possible while driving, that will give you better economy.

[Circlotron]

I'm going from Dandenong to Ballarat and back on Saturday so I'll see how that goes.

Righto then. 3 adults on board. Calm, fine day, 14 deg max. Some hills. Did 80 & 100 when I had to, 105 to 110 in 110 areas. (Speedo check on Western Highway said 101 when speedo said 100).
337.1km round trip with about 20km tootling around Ballarat proper.
Used 41.53 litres of lpg so that's 8.117 km/l or 12.32 l/100km or 22.93 mpg.
By jingos I'm happy with that. The old 202 Kingswood would only get about 19 mpg under similar conditions despite having a smaller motor that had done 100,000 km not 500,000+. It was slow as a wet week and had the aerodynamics of an average house. The Commodore just flew up any hill without a second thought. The engine seemed singularly unconcerned that it was pulling the rest of the car and three passengers along.

[pipzryd]

well im just about to drive from perth to darwin (4040km) in my v6 vp... i am towing a 6x4 trailer and will be fully loaded. im taking $1300 with me. i have done the math and hopefully it will cost me $900 max for fuel. $650 without trailer worked out on 9.5l/100k (standard figures)
i have just given it a service (engine and gbox) new air filter, fuel filter and i put this compression sludge in that i got from repco. its running alot better now so i hope i make it.. lol

so to keep in line with this topic i will get details on fuel consumption and post it on when i get to darwin. due to the fact im towing the whole way it will be a little off, but ill be sitting on 100km/hr the whole way... (my odo doesnt work so ill be working off 4040 km total travel.)
ill even take a couple of pics and upload them later...

hope this helps
regards, phil

[somefool]

13.5L-14L/100 - mixed highway driving and pizza deliveries, [grandma]. Empty car apart from me and subwoofers (50kg)
9L-10L /100 - highway driving at 100-120kph with a nearly full load - 3 passengers, luggage and 95RON fuel if that makes a difference. [not grandma]

if it was a v8 i wouldn't mind..

[ryan21]

Solid highway driving to cairns from melb most i got was 720ks on gas that was 80litres with 3 ppl and packed full of crap so 11.1 L/100. All city i get about 400-450 so 19L/100 lol big difference

edit: its vn v6

[m1lky]

Vy ss, averaged 9l/100k over 300k with avg speed of 90ish