posted on Sep, 11 2005 @ 02:33 AM
cant remember where i seen it, but above 80 kms an hour it is apparently better to have the air con on
as for the gears, you have to pick the correct gear for the speed.
if you are doing 30 in top, and put your foot down to accelerate, you will use more fuel than shifting though 2nd 3rd and then to 4th.
in a higher gear the revs will be lower, but to accelerate you have to put ya foot down more, opening up the throttle and allowing more fuel to get