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Petrol Consumption

jawrgy

By jawrgy,
in V Series (V35, V36, V37 & Infiniti)

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sonicii Veteran

sonicii

Posted
Posted

I bought my 05 6MT sedan back in 2011 and it has consistently returned between 10.5 and 11L/100km in the city and around 7.5L/100km on the highway (no idea what that is in km/l), hasn't really changed much at all over the last 11 years, has over 170,000km on it now.  Always used 98RON since the handbook specifies 96, although I suspect that may just be what they have in Japan.  Definitely 80L tank, I have some of the original brochures from Japan and they all say 80L.

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ELFGT350 Community Regular

ELFGT350

Posted
Posted
On 18/4/2022 at 3:03 PM, sonicii said:

I bought my 05 6MT sedan back in 2011 and it has consistently returned between 10.5 and 11L/100km in the city and around 7.5L/100km on the highway (no idea what that is in km/l), hasn't really changed much at all over the last 11 years, has over 170,000km on it now.  Always used 98RON since the handbook specifies 96, although I suspect that may just be what they have in Japan.  Definitely 80L tank, I have some of the original brochures from Japan and they all say 80L.

Hi Sonicii, thats really good thats 9.09 to 9.52 klm/l city and 13.3klm/L highway. Its slightly better than the best I got on average. I did these numbers numbers sometimes but not often.

Forgot to mention mine came with Impul chip & fujitsubi exhaust so that may account for the tiny difference. Also depends on how much mixed conditions- traffic/open rd driving. I have a little more pull than standard car.

  • 2 weeks later...
Vee37 Collaborator

Vee37

Posted
Posted

On my previous car (2003 350GT), I found that the car had noticeable better fuel economy if i kept around 80KM/h. If I cruised above that, the economy went down. At best, I think I was able to get it down to the mid to high 8l/100km (12.5km/l which included some 60kim/h to get to the highway).

Another thing I noticed, was that my fuel economy dropped at one point for some unknown reason. But, a few weeks later, one of my ignition coil started to fail (when cold). After I replaced two of them (another was heading out), my fuel economy got better again.

Now with my 370GT, I have to be very careful, and the best I have seen thus far (once, for a very short length of time at the end of a freeway run, with some city driving) is around 12.4km/l (ie 8.0l/100km, driving at 100 km/h) but usually its closer to 7km/l (14l/100km) around the city (currently siting on 6.7km/100km ie 15l/100kim all city traffic driving).

Not absolutely sure if it truly made the difference, but the best amount was when I accidentally filled up using 95octane, and then added an octane booster when I realised my mistake. Its actually an injector cleaner, but the reviews talked about octane boost. And maybe I got some placebo effect and/or drove more carefully/gingerly after reading the reviews or because I was on 95.

https://www.supercheapauto.com.au/p/rislone-high-performance-injector-cleaner---177ml/290781.html

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ELFGT350 Community Regular

ELFGT350

Posted
Posted
On 27/4/2022 at 11:15 AM, Vee37 said:

On my previous car (2003 350GT), I found that the car had noticeable better fuel economy if i kept around 80KM/h. If I cruised above that, the economy went down. At best, I think I was able to get it down to the mid to high 8l/100km (12.5km/l which included some 60kim/h to get to the highway).

Another thing I noticed, was that my fuel economy dropped at one point for some unknown reason. But, a few weeks later, one of my ignition coil started to fail (when cold). After I replaced two of them (another was heading out), my fuel economy got better again.

Now with my 370GT, I have to be very careful, and the best I have seen thus far (once, for a very short length of time at the end of a freeway run, with some city driving) is around 12.4km/l (ie 8.0l/100km, driving at 100 km/h) but usually its closer to 7km/l (14l/100km) around the city (currently siting on 6.7km/100km ie 15l/100kim all city traffic driving).

Not absolutely sure if it truly made the difference, but the best amount was when I accidentally filled up using 95octane, and then added an octane booster when I realised my mistake. Its actually an injector cleaner, but the reviews talked about octane boost. And maybe I got some placebo effect and/or drove more carefully/gingerly after reading the reviews or because I was on 95.

https://www.supercheapauto.com.au/p/rislone-high-performance-injector-cleaner---177ml/290781.html

Your numbers are bang on the mark for the 350gt. Syd traffic has gotten so bad now that its impossible to get near those numbers nowadays- especially with the mileage mine has done now. Question : Is yours an Auto or Manual?

Nissan say the 370 is slightly better on fuel consumption because of variable valve timing on both inlet/out can control the duration better. But not surprised given that real world driving is the real test.!. Also manual or Auto?

Vee37 Collaborator

Vee37

Posted
Posted
On 4/27/2022 at 11:53 AM, ELFGT350 said:

Your numbers are bang on the mark for the 350gt. Syd traffic has gotten so bad now that its impossible to get near those numbers nowadays- especially with the mileage mine has done now. Question : Is yours an Auto or Manual?

Nissan say the 370 is slightly better on fuel consumption because of variable valve timing on both inlet/out can control the duration better. But not surprised given that real world driving is the real test.!. Also manual or Auto?

The 350GT coupe was an auto. I don't own it anymore. As it got older, my economy dropped, but as I said, in my specific case, the aging/failing coils may have been at least partially responsible. And the good numbers were for driving about 20km city and about 50km freeway.

The 370GT coupe is also an Auto. As I think the numbers show, i have to be very ginger with the throttle to even approach the same numbers as the 350GT. In the real world, its hard to keep off that throttle all the time, and not bring yourself up to the speed limit, faster than what would really be necessary. One of the cars I inspected before buying my one, the owners mother drove it regularly and complained about how much fuel it drank. She complained how me and the inspector were sitting in the car idling to keep the AC running; it was a hot day and we were in the direct sun.

PS: With the additive, I added/eye-balled about 1/3 of the bottle, to about half a tank.

ELFGT350 Community Regular

ELFGT350

Posted
Posted

The most efficient way to drive these cars (as with most cars), IS to get them to 60 pretty quick and just use the upper gear to keep them coasting efficiently. Keeping the car in the highest possible gear - without the need to drop back often is the key to being efficient. Nannying it does not work!. If you watch the “Leaf” in the fuel consumption gauge you will see this. When I first got mine I was often averaging over 9klm/l in the city when traffic was less and I would keep momentum even in corners using 3rd at 30kph. Thats the fun of a manual even spirited driving is better for consumption. Constant slowing or accelerating from low speed under 30kph is where you burn the most fuel, because you are moving 1.6tonne from the most inefficient engine speeds. 

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