EHN-99, 2-Ethylhexyl-Nitrate 99% Pure 2 EHN Performance Enhancer Cetane Booster Diesel Treatment Additive, 1L Treats up to 1000L.

This is amazingly smelly stuff but I kid you not it's a bargain and we'll worth the money I bought 1ltr bottle for a test and no lie I normally put £40 of BP diesel and get roughly 130 miles of actual driving but the dash recons 200 milesI drive smooth in city I get bad mpg but rural which I do regularly 70miles a day I get fantastic mpg, I added 0.5ml per ltr of ehn-99 first time and noticed slight improvement on fuel then came the second time 1ml per ltr and oh my gosh I have driven the actual 200 miles and still have 60miles to goI had to share this review, my mpg hasn't changed on dash but actual fuel consumption on eco mode or driving smooth is fantastic and if you have led foot I tell ya what this is your buddy.Your fuel tank will stink when filling up like a stink bug smell and as you pour in if you get any on you it's a massive effort to get rid of the smell of you skin, but I swear if you use it right and wear gloves or be careful you will love this stuff. My next purchase will be maximus but for now I think I could drives for miles and miles and not need to look at my fuel gauge.Its well worth it

I have been using Millers diesel additive for years and recently went to Halfords for another bottle. A new assistant at the till was taking forever to deal with customers in front and I gave up and walkked out. I looked on Amazon for Millers but came across Hydra and decided to give it a try. I was using Millers at 1.5x dose for better performance but Hydra is more effective at standard dose, giving noticeably better performance and mileage. At half the price of Millers with better performance and fuel consumption gains this is a no brainer, try it, you won't be disappointed.

I use this alongside their DPB-100 fuel additive, in a high mileage 2009 Audi A4 2.0 TDI ….. before ever using this, I would struggle to achieve over 55mpg on long runs. Ever since dosing my fuel with 30ml of this and 30ml of DPB-100 (to a 60L tank), my MPG has increased and I’m now able to comfortably achieve 65mpg on long runs with the same driving style. Whenever I forget to dose my fuel with this stuff, I see a reduction in MPG to around 60mpg…… so it’s helped improve the economy even when there’s none in system.Overall, my economy is up by 18% since before I used it. A new MAF sensor may also be attributing to that figure, but what cannot be denied is the 8% to 10% improvement in MPG I see between having fuel treated with this and without it. I spend £3000+ a year on fuel, as I do a lot of miles, so an outlay of approx £50 a year on this stuff and the DPB-100 is saving me between £200-£250 a year, as well as having the peace of mind that my engine is running optimally.Also….. I’ve found that it improves supermarket diesel the most, so if you usually use shell or one or the more expensive places, you can save more going for the cheaper supermarket stuff and still see a similar return at the pump.I feel 65mpg for a medium sized 14 year old car with 146,000 on the clock is pretty good going! Treating your fuel with this, ensuring tyre pressures are correct and sticking to 60-65mph on the motorways you’ll save hundreds every year!

It seemed to improve the performance, so all good.

Found this item last year and bought a smaller container. The results were amazing. I have a 4x4 and tow a double axle caravan. This additive increased power, limited making gear changes required for hills and made the driving experience much better with increased power. I also use STP diesel injector cleaner. On last MOT the tester did the emissions test three times as the figures were so low. Remarkable, considering the vehicle has covered over 90k miles. Just make sure you measure this diesel additive, otherwise you will be tempted to put too much in the tank whilst guessing, which can work out expensive!

Quite a lot for these type of products are actually 'snake oil' but this 2-EHN is the real deal and makes your diesel engine noticeably quieter and more responsive and even increases the mpg by maybe a few percent.I've previously used Miller's diesel additive which is basically identical to this Hydra 2-EHN but this is half the price per litre and actually contains a higher percentage of the magic ingredient.A word of warning this stuff stinks if you get it on your hands so wearing some disposable gloves is highly recommended.

Only just got the item , I do alot of mileage so I with thoroughly test this and update in future.3 star until testedCons is not easy to distribute and the stuff lingers on you and your storage. Stinks

It has taken a while for me to write this review but can now confirm that this works.It has increased my average fuel consumption by 2,4mpg, that may not sound a lot but that is considerable. The other benefits include smoother running and more power making the car better to drive in all circumstances.The vehicle in question being a Volvo V70 D5 with over 150000 miles covered,my average fuel consumption now being 52.9mpg and that is mainly town work. Also my emissions for the MOT were lower than required.I have been precise with dosing, i use a syringe to be accurate. The benefits of this product are real, i have tried them all over the years but this one works, pays for its self.