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Nissan V6 Skyline Delivers 38 MPG in Road Test

Nissan Skyline 250GT.

A Nissan driving team extracted 38 mpg from a new conventional 2.5-liter Nissan Skyline in an “eco-driving” challenge on real roads with unpredictable traffic and weather conditions and with different drivers. 

The Skyline model, powered by the VQ25HR V6 engine (225 hp / 168 kW of power and 262 Nm / 194 lb-ft of torque) covered a 1,024.4 kilometer cross-country course with an average fuel consumption rate of 16.3 km/liter (38 mpg US or 6.1 l/100km).

Nissan began VQ engine production in 1994 and had produced a cumulative total of 5.5 million units as of last fiscal year, ended March 31, 2006. The new 2.5-liter VQ25HR engine and its larger cousin, the 3.5-liter VQ35HR, offer a 10% improvement in fuel efficiency compared to vehicles equipped with the prior generation of VQ.

The new VQ engines (the new HR suffix represents high rate of revolution and high accelerator response) feature a number of enhancements:

  • Reduction of weight and friction through adoption of asymmetrical piston skirt configuration. Nissan reduced the skirt width on the side with the least amount of pressure,  resulting in reduced friction.

  • Minimizing piston inclination, thereby reducing friction, by lengthening the con rod;

  • Addition of rudder frame, newly-designed cylinder block with significantly improved rigidity;

  • Adoption of continuously variable valve timing control (CVTC) for intake side and electromagnetic valve timing control (e-VTC) for exhaust side;

  • Reduction of intake resistance through adoption of symmetrical twin intake system and straight intake port;

  • Reduction of cam-valve lifter friction  by 40% through adoption of world’s first hydrogen-free, diamond-like carbon (DLC) coating; and

  • Adoption of catalyst substrate with ultra-low heat mass, super-ignition iridium spark plug and fast light-off O2 sensor control.

Overall, Nissan made more than 40 improvements to increase fuel efficiency by 10%.

The 1,000km drive took place on 16 March with a team of eight test-drivers under the Nissan Performance Innovation Task Team (PITT). The team started the drive from the test course at Nissan’s Tochigi Plant at 3:30 am. The Skyline drove through the Tohoku Expressway, Tomei Expressway, and Meishin Expressway with Kyoto as the turnaround point, and arrived at the finish line at the Nissan Technical Center in Atsugi at 8:54 pm, nearly 17.5 hours later on the same day.

The team experienced a variety of driving conditions including traffic jams from rush-hour congestion and construction.




i bet if i get to drive one of those, with a proper manual tranny + clutch, i'd easily go over that 38 mpg mark.

But not bad for the amount of power it contains the VQ series.


One interesting friction reducing measure is the
offset cylinder construction (as in the Honda Insight engine) but this cannot be done in a V-configuration engine.
In the Honda engine the bore center is offset from the crankshaft center.


It would be interesting to know what is the weight of this Nissan Skyline.


philmcneal writes: i bet if i get to drive one of those, with a proper manual tranny + clutch, i'd easily go over that 38 mpg mark.
I bet if I drove one, I'd easily get under 14 mpg.


I bet if I drove one of those, I wouldn't give a rat's ass about fuel economy.

Rafael Seidl

This test was performed in Japan, where maximum speeds are much lower than in the US, let alone Europe. The MPG figure does not translate 1:1 to traffic situations outside Japan, unless you drive very sedately - in which case, you'll get reasonable fuel economy with just about any car (not turck or truck-base SUV).



By offset cylinder axis you mean the design feature called desaxe (French should have two acutes!).

Anyway, you can do this in a v engine. VW VR6 engines have been desaxe for years. The fact that you can make each vee bore centreline when extended can down to the crank centre pass outside of the line of the crank centre means that you can have a desaxe vee design.

Been around for years as a method of controlling friction when piston motion was less well understood. It is no the sole method of reducing piston friction in engine designs.


I believe the record for the Honda Insight is something like 160 mpg. I don't know that this test of the Nissan is terribly meaningful, given the abscence of data about speed, acceleration, etc.


back 1n the early ninetes I drove a 3 litre mercedes E class estate six cylinder auto,
this car regulary returned 35 mpg on a run ! It does not seen worth all that effort to me , the exhust still stinks and maims our childen!


Can someone post the detials of how e-VTC works?


In the VR6 VW engine, 3 cylinders are offset to the right and the other 3 to the left (with respect to the crank center), so the friction reducing effect would be cancelled. So I think this method for reducing friction only works for in-line configuration engines.
See the schematics at:


tell me more about the body kits

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