>>1083748>Does it mean I am using less fuel because of the shorter-by-time journey?
You would use more fuel travelling more distance in less time, even though this 2 mile, 2 minute difference is negligible.
Think of it like this, if you jogged 6 miles in 20 minutes or 4 miles in 22 minutes, which route do you think you'd be more tired?
I would argue the faster pace of 6 miles in 20 minutes put more strain on your car than 4 miles in 22 minutes. Distance and time, less time = more stress = less efficiency.