Quote:
Originally Posted by Saskwatchian
Forgive my ignorance but are you saying that it was more efficient at 77mph than at 70?
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The short answer is under its current conditions and limitations, it was more efficient at 73-75 mph than at 70 mph.
This is because my car was requiring 2400-2500 to enter lean burn mode which nets about an extra 10 mpg at highway speeds. So ultimately:
1) Going 70 mph at 2300 RPM in 5th gear in normal burn nets about 36 mpg.
2) Going 73 mpg at 2400 RPM in 5th gear in lean burn nets 45 mpg.
If I was able to get into lean burn at lower RPMs (as I sometimes am able to do.) I would have expected to see better results at the slower speed, but since lean burn was only engaging over 2400 rpm, it made the higher speed with lean burn more efficent than the lower speed without.
Quote:
Originally Posted by Saskwatchian
also why would anyone cruise in 4th at 70mph? It makes me wonder if the car is geared too high for how it is driven?
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Driving on flat I can be at 2400–2500 rpm going 67-63 mph in 4th gear in lean burn netting 54-58 mpg on flat. It also is ideal for climbing most hills at highway speeds getting 40-50 mpg depending on the incline.
The VX trans is geared really high, but I am finding a use for all the gears. It combined with lean burn gives me more options. And with more options I have a better chance of using the optimal combination to use the least amount of fuel as possible.