In Indonesia, fuel efficient car has been offered as a part of low cost green car program, or LCGC in short. The cars that are part of LCGC program are:
Because cruising at an efficient speed uses much less (fuel) than the maximum power of the engine, the optimum operating point for cruising at low power is typically at very low engine speed, around or below 1000 rpm.
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My car is Daihatsu Ayla Tipe M. It comes with economy tire, 155/80 R13. The engine is 3 cylinder 1000cc, with 65hp@6000rpm and 8.8kgm@3600rpm. The recommended fuel is RON95 but I use RON88. This is intentional since I believe that my modification is good enough to compensate the difference in octance. I use 6 small device made with cemenite technology. I put 4 at the fuel line, 1 at spark plug wire and 1 at the PCV pipe. Since I only need to attach them, I do not need to modify anything. The car is stock without any modification.
The best result from published article for Daihatsu Ayla report 28km/liter (65 mpg). But I found that getting 35km/liter (82 mpg) is easy:
I have experimented with a few combinations of gear and rpm. I suggest you have patience during the experiment, in the end it will be worth your efforts!
I have found that driving in 3rd gear at 2000 rpm produced 25 km/liter, and 4th gear at 1200rpm producde 35km/liter.( Both are at the same speed). Cruising at around 30km/hour at the 1st gear produce 11km/liter, 2nd gear produce 18km/liter and 3rd gear produce 25km/liter. So it is clear that cruising at higher gear produce better mileage for the same speed.
Then I found that the best mileage happened when I drove at 45km/hour at 5th gear.
I got 45.6 km/liter which is equal to 107 mpg (US). Because I have only used one type of modification, I need to continue experimenting because there are so many ways to increase fuel efficiency. Some people assume that driving with rpm that low make their engine vibrate and knocking, but I have shown that it is possible to do with simple and cheap modification.
Even though I do get better gas mileage, I must say the vehicles power has not decreased either, which is a positive thing. I would like to make some comparisons with others out there who are attempting modifications as well, so I would like to hear from you. I do know that for myself, I have obtained better gas mileage (than I did before the modifications that I made) as well better power. It can be done.
I hope you can try this too. Please share your results.