"Shift at 3,000rpm.."
I shift at 2,000rpm in first, second
By third gear it is down to 1,700
I am in fifth at 32mph.
I get on average 32mpg with mostly city driving.
I drive most during non rush hour traffic. and most routes with few stops via stoplights.
I would restate that stopping a lot is the huge gas guzzling thing.
City traffic with a lot of stoplights and waiting at stoplights will definitely kill mpg by 20%/30% easy.
A start from a complete stop uses up as much gas as driving a mile with no stopping (and starting at the designated mph). IMO.
IE on cruise on the freeway at 55 a full mile distance the gas used it equal to one acceleration from a complete stop up to say 30mph.
No proof or statistics.. Just what it seems to be from my driving this Focus.