Fuel economy thread

[henk4]

In the silvia I noticed using premium I got atleast fifty kilometers more from a tank each time over regular and E10. Was very good on fuel too.

probably also psychology played a role here. You wanted to justify for yourself that you paid more for your fuel, and therefore you drove a little less aggressive

[Kitdy]

I am no expert, but I highly doubt that premium fuel would have anywhere near as large as a 50km increase on a tank of fuel.

What says the resident fuel buffs?

Matra?

[clutch-monkey]

afaik his car is supposed to run on premium (98 RON even, being a grey import) from the factory, so the state of tune could explain the difference

[!!shouter!!]

The higher octane gives the same power for less throttle so that might come into it.

[henk4]

The higher octane gives the same power for less throttle so that might come into it.

possibly, and welcome to UCP btw.

[Zytek_Fan]

possibly, and welcome to UCP btw.

Higher octane gives more power, so yes, it could be possible. It'd be worth testing.

[fpv_gtho]

AFAIK the higher octane just increases the response and allows more compression which is where the extra power comes from.

[targa]

'97 Saturn SL2, 1.9L inline-4, five-speed manual (172,000 miles :-\)
87 octane, manufacturer suggested

I normally don't hit it too hard. My powerband doesn't start until around 3600rpm, until then, there's really nothing to work with that's any fun; so I normally ride the gear up to about 2500rpm then shift up to the next gear. Get about 36mpg in the "city" in which I live (it's not that big, but the stoplights still work the same); I took a 430 mile trip up to Pittsburgh a few months ago on less than a 12 gallon tank, it must have been something around 10 gallons that I used, because I remember doing the math upon filling up to return and it coming out to a little over 42mpg.

[jcp123]

47,18mpg (5,58l/100km) on the first two tanks in the Harley. Should improve as the engine loosens up.

Mustang's been averaging a lot better. 15,7mpg (14,98l/100km) over the last month, 14,7mpg (16l/100km) all-time.

[Ferrer]

The last two tanks in the Mini yielded 10,9l/100km (22mpg US/26mpg UK) and 9,1l/100km (26mpg US/31mpg UK) respectively.

I'm happy to have dropped below 10l/100km.

[f6fhellcat13]

98 ford escort sedan(US model) 28-33mpg (8.4-7.1L/100km)
11gal tank always lasts at least 300 miles
sometimes i ride the clutch( it thnik thats what its called when you put the clutch in and coast) when im going downhill dunno how much that helps my economy. i do it mostly because it makes the car quieter

[Waugh-terfall]

no no no no no! never do that! Lessens your control of the car, increases wear on the clutch and the brakes, when going downhill you select a lower gear and use the engine to keep your speed steady. You would be failed on your driving test for that under 'serious driving fault'

[f6fhellcat13]

fortunately i took the test in my moms automatic, thanks tho

[Blue Supra]

Slip it into neutral man! Dont put the clutch in if you just want to coast!

[fisetdavid26]

Dad is getting 9.8L/100 km with the Cobalt, I'm getting 12.3L/100 km...

I blame 'sporty' driving