[euromodder]

I once read a report on how higher speed requires more gas - and the most economical steady speed was 30 kph (20 mph).

I was very sceptical about that, as it was performed with a car like mine, though I never could get anywhere near decent mileage at that speed - in fact, slow speed killed my average every day.

Later I found out that 30 kph in 3rd on CC works a lot better.
Still not anywhere near the claims though.

Then I tried 30 kph in 4th, at idle (around 800 rpm) and the magic happened.
As long as you're on level ground, the mpgs are simply stunning.
Doing this on a circuit as in the test, it's easy to see where they got their results !


It doesn't work in any other gear though ...
1,2,3 means you're going too slow to cover the miles and still get good mpg.
5 can't efficiently propel the car at idle - though it will, while lugging hard and guzzling diesel.