It's a 2006, so the mileage should be an improvement over the previous model. Mostly the initial problems were in the ECU, if I recall the earlier discussions on this forum. My car new, was putting out between 26 and 28 mpg. Now with 9000+ miles, it routinely gives me 29-31 mpg on my weekly commute. 5sp BTW.
More specifically: Cold air intake, straight-through exhaust muffler design, and don't take off the cat. converter unless you make it into a dedicated race car. More obvious stuff later on: verify proper 02 sensor function, keep equal air pressure in the tires, etc.
And as mentioned, the ECU needs a bit of time to adjust to your driving style and to "program" itself to function to the best of its ability. You might notice a slight bit of hesitation or the transmission acting weird during various driving conditions, but overall the driving experience wil smooth out and the gas mileage will go up accordingly, usually by 1k miles.
For sure the milage is gonna improve once its broken in. My Optra 5 is an '04 and its getting about 28 miles/per.
Biggest tip. Dont drive like you stold it, even though the car yerns to. Resist the urge! Be strong!
And I am almost always pushing my car a little harder than i should. <_<
So if i drove proper just a little bit more it would improve i'm sure. but I agree with Intruder, a better than stock intake and exaust sytem will help.
I don't want to make you a bad dream. But if you have my nightmare!!!!!!!!!!
I make 14/l 100km or 16.8mpg/us or 20.2mpg/imp. in town, and around 24mpg/us, 10/l 100km or 28mpg/imp. on free way. I have a 2004 Optra (automatic), and i have around 15000 miles on my car. The other days a person from GM call me to said, we can't make anything for you that's normal.....
Best mileage gains come from a conservative driving style. No off-the-line gunning, especially when the engine is cold; reduce idle running time; and if you can, build a road above everybody else so you never have to stop in traffic. :P
I have never smelled as much raw fuel coming out of a tailpipe from a cold engine idle as I do with this engine. It's quite rediculous, actually. This engine is not particularly designed with fuel economy in mind...rather old-school thinking anyway.
In all reality, this car blows for fuel mileage next to the grand majority of its competition. I keep very detailed numbers of my wife's car per fillup. In city driving, with 4 km trips to-and-fro her workplace, a full tank nets me an average of a paltry 350 kms from 50 Litres. The fuel consumption rate is rather good only on the highway. I've managed excellent numbers on long trips, routinely at 125 km/h on major routes. Still, this car and engine should push the 40 MPG region, and it doesn't; that is, unless you ever wish to drive 10 km/h below the speed limit everywhere you go.
Best mileage ever recorded was 39.93 MPG - worst was 13.63 MPG
A better standard measurement of fuel consumption is that my car currently averages 10.25 Litres per 100 kms over 26489 kms total (16555 miles).
My 3.4L DOHC V6 gets better mileage in a car tipping the scale at 3600 lbs.
I will reiterate that. I have a Hyundai Elantra, and although it is rated a little better than the Reno, I was disappointed with my mileage. Then I started to really try to drive more conservatively and my mpg went up by 2 or 3. Then... at 7800 miles the engine threw a "running too rich" code. I pulled the battery cable to reset the ECU and my mpg went up by another 2 mpg. So now I'm sittin' pretty, running in the high 20s.
Also, a lot of cars these days have "adaptive techonology" where the ECU learns the driving style of the owner. The learning curve can be several thousand miles.
Naturally, when you have a new car, there is the tendency to lean into the pedal to see what you've got and the car learns your bad habits and enables them. When I reset my ECU it was like starting with a clean slate and because I had already altered my driving style to go a little easier on the gas, the mileage improved even more.
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