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While I was looking into the Xado product I saw that Redline did a idle fuel efficiency test. Basically, you let you car go to empty, add a specific amount of gas, and see how long it idles until it runs dry. Because driving methods affect MPG much more than some small gain in efficiency, this seems like an interesting way to compare the efficiency of our engines.
Possible problems:
1) Urban legend or not: Running until completely dry will suck up the nasty stuff in your tank.
2) Harm to the fuel pump.
3) Idling efficiency <> driving efficiency. You would need to make sure your car is well-tuned and the idle set properly. If one engine idles at 800 rpms and another at 825 then the test really doesn't work.
I suppose the best test would be to lock the RPMs on a dyno at say 2500 and then just do a MPG test. Even then you would need to make sure you had the same tranny ratios.
Thoughts?
Possible problems:
1) Urban legend or not: Running until completely dry will suck up the nasty stuff in your tank.
2) Harm to the fuel pump.
3) Idling efficiency <> driving efficiency. You would need to make sure your car is well-tuned and the idle set properly. If one engine idles at 800 rpms and another at 825 then the test really doesn't work.
I suppose the best test would be to lock the RPMs on a dyno at say 2500 and then just do a MPG test. Even then you would need to make sure you had the same tranny ratios.
Thoughts?