the relation between revving your car and fuel economy?

[burnsy150]

is it really worth granny footing your car around 1700-1900rpm each gear then to drive it up around 2000-2500rpm....is the fuel saving any much better?

[88GreenVN]

My V8 hates 60kph. uses heaps more fuel getting to 60 slowly (15 to 16 L/100). I use moderate throttle to get up to speed. Cruising at 100 to 110kph gives the best economy (around 11 L/100)from the V8.

As for a V6 - cold starts are a killer on fuel. Again moderate throttle gets the best economy for my cars.

[VL_5SPEED]

You will burn more fuel granny driving your car....

[Morton]

Also depends on what the traffic is like If you know you're going to spend a while at or above 60, get there moderately fast. If you know there's another twenty sets of red lights ahead, you're probably better off being a granny and coasting up to each set of lights.

[nicko]

i have often wondered this, my digital fuel usage thingo says that when im going up a hill in 4th gear it uses say 15L per 100 but if i drop it back to 3rd and keep the same speed (60km) i will use 11L per 100. the harder u have to put the accel down the more fuel its going to use, sometimes having more revs but using less accel is going to use less fuel

[Morton]

This is very true, as the car uses less effort (has more torque at the appropriate revs) to get where it's going. I often find, for example, that it's good to keep the car in third under 60kph.

[Wagon_Wheel]

Yeah, mines pretty bad around town, but i dont care, i give it stick through the gears, i dont see the point in striving to save 2-4 ltrs per hundred k's, meh.
Mines MINT on the freeway, about 8ltrs/100k's, wont be after i change the diff though lol

[vlv8vic]

I know it isn't a commodore but i've tested this with the camry. If i flog it i lose about 50k's on granny speed. Just changing at the right times and not flooring it.
Not as fun though.

[burnsy150]

yeah i thought it would be a pretty good topic to bring up...as im only getting around 300 city kms, ive tried granny driving n just my normal style of driving which seems to get a bit further of a tank...i just always thought the less you revved the better economy u get...i guess not

[nicko]

yeh its a tricky one!! as is said alot on this forum if your getting poor economy try some injector fluid, pump the tyres up to about 40psi, get the car serviced and tuned etc. my mate in his VT S2 Spack would get better economy when he had his car in power mode due to the car being able to use its torque better rather than creating the power with excess fuel

[And_ROOS]

I know that if i dont granny it but dont flog it i get best economy.

If im too light or too heavy on the accelerator its usually a bit of a guzzle.

[Trewman]

I find if I granny it I get roughly the same K's as giving it a bit to say 3000rpm. When i flat stick it thats when it starts guzzling.

[commsirac]

The faster the engine revs, the more fuel it will use.....(thats why we have things like overdrive etc), unless severely labouring the motor....going uphill in top gear at 60km/h would be labouring the motor.

[savage1987]

On a side note, a lot of Gen III manuals go really well if you can keep shifting at 1500rpm. This makes for hell slow driving (using throttle position 1 or 2) but they have a well designed combustion chamber that seems fairly useable down low. I got a standard VY SS manual to run under 10L/100km through moderate traffic in town

Interesting topic though, some good info. I'll stop granny driving my 5L now, thank you
Sam