Engine data: www.gmpowercomponents.com/10i12vtwinport.htm
Please look at the torque and power curves.
No people just guessing 56mph please. Preferably engineers or designers or scientists or experts, no guessers. This isn't the "magic number" for all cars. It also depends on the gearing.
In 5th gear 1000rpm=19mph, 2000=38, 3000=57.......
The twinport engine has blips in torque and plateaus all over the map. I just want to know if cruising on the motorway what road speed or rpm will give maximum distance per gallon of petrol used.
This is of course cruising on a level motorway in 5th gear and considering dynamic factors such as wind speed at 0mph.
2007-05-12 05:21:32 · 4 answers · asked by Anonymous in Cars & Transportation ➔ Car Makes ➔ Vauxhall Opel
There is also no way that lower revs always = less fuel. 30mph in 5th gear must be bad for such a weak engine. If your foot is to the floor doesn't it go into enrichment mode? The optimum speed for 5th gear must lie between 40mph and 65mph. Surely, but where?
2007-05-12 05:29:37 · update #1
http://www.gmpowercomponents.com/10i12vtwinport.htm
2007-05-12 05:37:00 · update #2
What does the intersection between the power and torque lines represent?
2007-05-12 05:38:32 · update #3
Most data that I've ever seen seem to indicate that all things considered, the best fuel economy is found at speeds of around 45 MPH...there are complex formulas for determining wind drag on various body types and drag coefficient and power input required is proportional to the cube of speed to accelerate or maintain a certain road speed....as you aproach 45MPH, a vehicle requires more power input than is efficient and economy starts to suffer.
2007-05-12 05:45:31 · answer #1 · answered by paul h 7 · 0⤊ 0⤋
Lower revs = less fuel. Speed isnt the factor, revs is. Modern cars have fuel injection which is electronic meaning that it doesnt matter if your foot is flat to the floor as the fuel is electronically distrubuted NOT squirted regardless like older carb cars. So the revs are very relevant. Higher torque helps which a 3 cylinder won't have that much of (hence the economy of diesels)
2007-05-12 05:24:45 · answer #2 · answered by Anonymous · 0⤊ 0⤋
When there was a petrol shortage years ago they advised doing 56mph because it was the most economical.
2007-05-12 05:29:52 · answer #3 · answered by des c 4 · 0⤊ 0⤋
uhhh... i get 10 mpg in my tahoe in usa
2007-05-12 07:40:39 · answer #4 · answered by TAHOE GUY 2 · 0⤊ 1⤋