Economy Remap Glasgow — Green Map MPG Tuning. Our Green Map economy remap in Glasgow is written for drivers doing the miles. We flatten the torque curve low down so the car pulls in a higher gear, cutting fuel burn on motorway runs, school runs and fleet work across Glasgow and the central belt. A typical 8–15% MPG improvement when driven sensibly, with smoother, more relaxed low-rev driving as a bonus — ideal for the vans and high-mileage diesels working the M8 every day.