5–15% on most modern diesels driven sensibly. Petrols see smaller gains. If you use the extra power, MPG stays the same.
Economy-focused remaps are one of the most undersold benefits of tuning. Here's what the real numbers look like.
Will a remap pay for itself? — On a high-mileage diesel doing 20k+ a year, yes — typically within 18 months on fuel savings alone.
Does premium fuel help? — On petrol remaps with higher boost, yes. On diesels, standard supermarket diesel is fine.
Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].