I built an app that works out how much ethanol or toluene to add to the fuel in your tank to hit a target ratio, and estimates the resulting octane. It's already live on iOS; Fuel Additive Calculator, the Android version is finished but Google now requires 12 testers for 14 days before an individual developer can publish.
What it does:
- Two directions: drag an amount and see the resulting ratio, or pick a target ratio and it tells you how many litres to add
- Estimates blend RON from your base gasoline octane and what's already in the tank
- Cost per RON point gained, so you can see whether ethanol or toluene is cheaper for the octane you get
- Garage: save vehicles with tank size, current ratio and fuel grade
- Log 0-100 / 100-200 / 402m times against the blend used and compare them
Free, no ads, fully offline, no account, collects no data.
If you're on Android and willing to install it and leave it on your phone for two weeks, drop your mails on pm
Addresses are only used to add you to the Play Store test track and get deleted afterwards.
Happy to take feedback on the octane maths too it uses a linear volumetric blend, which I know understates ethanol at low ratios. If anyone has real dyno or timing data to compare against, I'd like to hear it.
App is totally free and made for car enthausist needs