MPG Maximiser
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MPG Maximiser


Pay £/mo. at 0.00% APR.

18+, T&C apply, Credit subject to status.


How Can Water-Methanol Injection Boost Fuel Economy?

More power is typically developed from a given amount of diesel. Simply put: The more fuel you add to a diesel, the more power you make. Methanol is an additional source of fuel, and water adds power via the “steam effect.” You are replacing expensive diesel with inexpensive water or water-methanol. In fact, with a diesel, if you are using winterblend windshield washer fluid that costs £1.82 a gallon and diesel is at £6.46 per gallon, you can quickly make a saving. Example> typical 4x4 over 500miles that averages 25mpg using a 30% meth mix will save £27.86.

When water/methanol injection is used in a petrol engine the combined fuel behaves like 120 octane. A high octane rating doesn't really provide an increase in power. However, it permits an engine to produce more power. An increase in MPG is an indirect result of leaning out the fuel and advancing the ignition timing.

The water/methanol injection is best used with a customizable engine remap. This would enable the ignition to be advanced (about 5-15 degrees) and stoichiometry to be leaned out to 12.0 to 12.5 at wide open throttle. Different cars will have different results, plus some modern cars have ECU's which will make most adjustments as standard. (5-15% est).

To realize maximum fuel economy, water-methanol injection should take place as soon as possible and not just at high engine load states. This is the basis for the MPG-Maximiser system. This system utilizes a PROGRESSIVE CONTROLLER for activation, it reads the signal from a built in 3 Bar map sensor which converts boost into an electrical signal, allowing the user to start flow at 15% from as low as 3psi boost and then ramp the flow upto 100% from as low as 5psi boost allowing you to create a very linear flow for maximum MPG.

Don’t buy a knock-of brand kit with cheap parts for you beloved car, unlike many other brands the Devils pump (Shurflo 8030 series) can run 100% methanol or alcohol as it's chemical resistant or run dry without getting damaged with its EPDM /Nylon valves, Santoprene diaphragm, and adjustable peek pressure from 150 to 300psi. It can also prime itself up to 8ft, so unlike others it doesn’t have to be gravity feed making a lot easier to mount, very handy when space is an issue. This kit only uses the highest quality parts.

Many people ask 'Does the kit come with a tank', No, the simple reason for this is as 90% of people just use the cars standard windscreen washer bottle.

We do though strongly recommend our 2.5 or 6 gallon tanks, so if your a high mileage user you won't need to constantly refill the tank, typically the 2.5 gallon tank will last 5-600 miles.

The system can give up to a 20% increase in MPG, reduce EGTs by 300 degrees and boost both horsepower and torque.

This kit will fit any supercharged or turbocharged diesel/petrol engine etc.

Kit Contents:

  • 300psi Pump with EPDM seals
  • Allen key can be used to adjust water pump pressure
  • Progressive Controller
  • 15' of High Pressure Black Tubing
  • Injector (please supply engine cc & max boost + rpm so we can supply appropriate sizes).
  • Nozzle Holder
  • Heavy duty Nickel plated Check Valve
  • filtered self-sealing tank tap
  • All fittings needed for installation
  • Inline Fuse Holder with 10 amp fuse
  • Zip ties and wire splices and connectors
  • Install Instructions with stickers.
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Please allow up to 1 working day to process your order. Orders received before midday (UK Time) Monday to Friday will normally be despatched the same day. Orders received after midday or at weekends will be dispatched the next working day.

Should you have any problem with your purchase please contact us either by Instagram, Facebook or by using the Contact Form on the website, and we will arrange with you a method of redress suitable to your situation.

All Warranties lie with the manufacturer. Terms and conditions apply.

Warranty and Returns 1. Length of Warranty The warranty term for new alcohol/water injection systems purchased from Devilsown Injection is one (1) years beginning on the date of the invoice for the original purchaser, as further described below. Pumps, Pressure Switches, Solenoids, Fittings, and all other parts and upgrades sold separately from the alcohol/water injection systems carry a ninety (90) day term as described. Refunds will be issued within 48hrs of the faulty item being returned should a replacement not be required/desired, replacement items will be sent on the same delivery service as the original ordered item.

2. What is Covered Devilsown Injection warrants the original purchaser that only the products it sells are free from defects in materials and workmanship. This warranty also covers damage due to the shipping of products to you. This warranty does not cover damage due to external causes, including accident, abuse, misuse, acts of third parties, servicing not authorized by Devilsown Injection, Product modification or repairs (this includes products disassembled), usage not in accordance with instructions accompanying the product(s), failure to perform required preventive maintenance, including but not limited to cleaning filters, and problems caused by use of parts and components not supplied by Devilsown Injection. Devilsown Injection and Methanol Injection UK are not liable for any time or costs incurred if faulty items are not fitted by our own workshop. This includes any return postage costs. Items returned with damaged or missing warranty labels are not covered by our warranty.

3.Return Policy Devilsown Injection will not accept any returns after thirty (30) days beginning on the date of the invoice unless pre-approved. For a return RMA you must contact Devilsown for approval. The item must be un-installed in the original box, in new, unused condition. You must have your original receipt and must contact us within 14 days of receiving your item. After 14 days All opened or unpackaged returns are subject to a fifteen (15) percent re-stocking including the original shipping charge (excluding faulty items). You are responsible for shipping the item to us at your expense. PayPal has revised its “Refund” policy from 16th March, 2020. If you cancelled your order for “NO REASONS” or “INCORRECT CHOICES” (wrong product type etc.), or “INCORRECT SHIPPING ADDRESS” you will not be able to get the full amount refund. Unless there are defective product issues. In this case, order cancelled, “ the PayPal handling fee will not be refunded”. Please be double check your order before completion.

4. Shipping Damage & Discrepancies If you receive your order with incorrect or missing components, you must notify Devilsown Injection in the manner described above within 72hrs of receipt. In the event of shipping damage, you must also notify Devilsown Injection in the manner described above, Photo evidence may be required to process the claim with the courier along with possibly the item to be returned to Devilsown. Small uk orders are shipped on a 24hr service, larger items on a 48hr service

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