Start with the way you use the vehicle
A Stage 1 Eco calibration is intended for drivers who prioritise fuel economy. Your route, traffic, load and driving style all affect the result. A diesel van doing repeat motorway trips gives you a more consistent comparison than a car alternating between school runs in London and long trips at weekends.
Measure it tank to tank
- Fill up and reset the trip counter.
- At the next fill, record the miles driven and litres added. Use the same fill level each time.
- Divide miles by litres, then multiply by 4.546 to get UK miles per gallon. For example, 450 miles on 45 litres is about 45.5 mpg.
- Compare several tanks with similar routes and loads.
Keep a baseline before the tune so you have something useful to compare afterwards.
Check the car before choosing a tune
Tell us if fuel use recently went up, the car feels down on power or a warning light has appeared. Those symptoms are worth investigating before you decide on a remap. We list Stage 1 Eco at £240 and check whether the car and engine are suitable.