Frequently Asked Questions

Why Choose THOR and more-mpg.co.uk?

THOR is not just "another tuning outfit": we have experience in tuning anything from 30 horse power Minis to 1000+ horse power dragsters. We are a locally run and family owned independant with business premesis in Coventry. We take pride in our work and believe we offer value for money without sacrificing quality of service or parts.

THOR gives you the choice of the level of tune you want. Be it performance or economy tuning, we have the ability to reach your exact requirements. If you can't decide between a multitude of options, then fear not, as we also have an option that allows you to have multiple maps available for your car at the press of a button -our V-Switch device.

Will re-mapping invalidate my car's warranty?

The way THOR files re-program a vehicle is completely undetectable. All codes and diagnostics that a dealer may read will remain exactly the same. We say it with confidence because of the rigorous testing regime all files go through, and we even give a 12 month software warranty to you.

But be warned - not all tuning companies can say this.

Can the car be put back to its standard BHP?

Of course it can and we offer this service free of charge. But we'll bevery surprised if that's what you want after taking control of your vehicle'sperformance.

Should you lose your tuning files due to dealer actions or partsfailure your dealer will be happy to re-install the map onto your car for a small admin fee.

Should I tell my insurance company?

Whilst the upgrade is undetectable, the responsible answer to this question has to be "yes", your insurance company should be notified.However, many insurance companies do not penalise you for upgrades of this nature, particularly if you're tuning for increased economy.

Adrian Flux Insurance is one such company.

Will my fuel consumption go up after an upgrade?

No, in fact quite the opposite. Even on a performance tune, if youcontinue to drive the car in the same way as you did before the upgrade, yourfuel consumption will probably improve. Of course if you have a track map installed on the car and you are driving the car under the conditions withwhich a track map is intended you're likely to find a slightly reduced mpg figure.

Economy tuning can have a dramatic effect on fuel consumption, with considerable improvements being achieved along with huge money savings on fuel.

Will the life span of my engine be reduced?

No, not at all. Sadly some engines can be over tuned, "stressing" the engine, transmission, cooling systems, etc, and reducing the life span and reliability of the car. This is why it's so important to choose the best tuning company.

We take great care to ensure that all of our modifications have no detrimental effect on your car. In a lot of cases the economy tune actually helps to extend the life of components such as the clutch and gearbox by making the delivery of the power far less aggressive and smoothing the overall driveof the vehicle.

Are plug and play re-maps and files sold on E-bay any good?

There are a number of basic power upgrades available in a plug and play format or are down-loadable from the web. Whilst some of these items can offer slight increases in power, they operate by merely adjusting a specified signal within the ECU by a set tolerance. It's impossible to compare these inferior upgrades with a full rolling road re-map which measures and adjusts hundreds of signals and data files within the ECU.

We advise that these generic files and unsupported devices for sale on the web should be avoided at all cost. We've seen too many customers come to us after a bad experience - and there was no one else to turn to either. We're always happy to advise on your tuning needs.

What does it cost?

Economy re-map prices start from

£249 inclusive of VAT,

  • Multiple vehicle discounts available. (get the whole families cars converted and reduced rates)
  • Fleet Managers, please contact us with your requirements.
  • 7 Day money back guarantee and Insurance approved.

Save 10-20% Off Your Fuel Bill 


We optimise your cars engine computer to improve fuel economy.

Book today and start saving!

To make a booking please call our service desk during office hours on our local call rate number
    0330 555 4545
(option 2)
or email sales@more-mpg.co.uk and we'll get back to you as soon as possible!

Mobile Service Available

You can save more fuel by asking us to come to you. 0330 555 4545

How much fuel and money can you save on your car? 

CO2 footprintFind your car using the boxes below and the fuel economy improvement will be displayed (tick economy check box). Almost all European vehicles covered. More Japanese models will be released Mid-April.