Updated May 10, 2015
My personal challenge to gain more from distance from the fuel.
Today i gain the best fuel economy of 13.8 km/l or 32.47 mpg, effectively broke into the 700km range for a tank of fuel, 51 litres. Yay!
Much of european makes yield great fuel economy. What about Japan made vehicles?
This will be a little sharing of what I did and putting to rest some myths that we read online.
A little history and background on how I arrived here.
Over the past one year since I took ownership of a 5 year Honda Stream then (see below), I replaced components and studied it trying to figure out how the car works.
Anyways, The Honda Stream is a variant of the Honda Civic, powered by a R18A motor.
A little history
The motor saw a head gasket burn which saw the car doing 300 km on a 50 ltr fuel. (6kpl or 14 mpg) There is also an oil sludge situation which I cleaned up with manually removing the carbon bits and frequent oil change. No engine flush for me!
Today, the motor is doing well above and exceeding that.
You can follow me on fuelly.com for the ride.
There are two areas of improving the fuel economy of the vehicle.
Part 1. Vehicle
Part 2. Driving Style.
Part 1: Vehicle
I am targeting sensors that have an effect on fuel delivery since it is totally controlled by the ECU (Engine Control Unit). The accelerator pedal is control for the throttle plate (Air).
1. Mass Air Flow Sensor Cleaning
Item 21: 37980-RNA-A01
The single most effective gain on fuel economy happened after the MAF Sensor (Mass Air Flow) was sprayed clean with electric cleaner which can be used on plastic.
An improvement of the procedure in the link above: There is no need to disconnect the battery terminals. Unplugging the wire harness to the MAF sensor will achieve the same effect.
Air dry the MAF sensor.
2. The Upstream and Downstream Sensors
The theoretical lifespan of these sensors is rated around 100,000 km.
The Oxygen and Air-Fuel sensors control the stoichiometric air-fuel ratio that results in Rich burning or Lean burning. This affects the fuel delivery by the computer system.
I have found both sensors sold online that are legit parts at a fraction of the price compared to agent prices.
Oxygen sensor (Item 13)
36532-RNA-A01 USD $62.11
36531-RNA-003 RMB $400
Both works from my usage for the last 9 months.
Here are the specifications of my ride:
1. 35 psi Tire
2. Shell 5w-40 synthetic oil
3. Caltex 92 fuel
4. No spare tire - Actually the additional weight of the spare tire made no difference.
5. Minimal Air conditioning use.
6. Techron Concentrate Plus before oil change.
Fuel grade: The Honda R18A can run safely on regular octane 92.
There is no pinging or loss of power at start. Why? The engine ECU learns and adapts itself and our drive habits.
Part 2: Driving Style
The dashboard has the green ECO light and we are encouraged to see it lilted up as much as possible.
This list can be commonly found on most economical drive websites.
Ultimately, the driver's foot determines how the motor will run.
Here's an extract from the web link with some of my feedbacks.