Originally Posted by Grumble7
. I got 22-23mpg driving quasi aggressively 70+ mph (approx 120 miles/day, 90 of which are hwy) Then I got 25-27 during the same commute by changing driving style slightly and abusing the cruise control. (65+ mph vice 70+)
I still dont get how breaking in an engine improves mileage. It should run to spec right out of the box, but this is merely an unsupported opinion.
So you gained a huge 4 mpg by slowing down 5-7 mph... The Imp is not aerodynamic...
It's not just the engine breaking in. Every piece that spins will gain clearance, and smooth out. Gears, CV joints, bushings, seals, bearings.
My 2000 Outback showed a big jump in mpg after the first 8,000 miles. I was commuting 100 miles one-way, and could duplicate mpg tank-after-tank.