e85Cal vs KTuner FlexFuel
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
e85Cal
This app assists users in calculating the precise amounts of standard and ethanol gasoline needed to achieve a desired ethanol percentage in their fuel mix. It simplifies the process by taking into account tank size, current fuel level, and the ethanol content of available fuel types.
- Calculate ethanol percentage goal
- Enter gas tank size
- Input standard pump gas ethanol %
- Input ethanol pump gas ethanol %
- Set target ethanol % mix
- Enter current fuel level %
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e85Cal help you calculate your ethanol percentage goal. It fast, simple, and easy to use. Just enter the following information: 1) How big is your gas tank? 2) What is the ethanol % in the standard pump gas? 3) What is the ethanol % in the ethanol pump gas? 4) What is your target ethanol % mix goal? 5) What is your current ethanol % min in your vehicle? 6) What is your current fuel level % in your vehicle? Results will display how many gallons or liters of standard and ethanol gas to pump in your vehicle based on your input.
KTuner FlexFuel
This utility app connects to specific hardware units via Bluetooth to display real-time ethanol content and temperature. It provides essential data for users monitoring fuel mixtures.
- Bluetooth BLE connectivity
- Real-time ethanol content display
- Real-time temperature display
- Supports KTuner FlexFuel units
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The app connects to the KTuner FlexFuel units using Bluetooth BLE and displays realtime ethanol content and temperature.
Screenshots
Verdict
The clearest difference is update cadence: KTuner FlexFuel at daily against e85Cal's every 4 months. KTuner FlexFuel also leads on rating (5.0 vs 4.7). e85Cal's advantage is ratings volume (35 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
KTuner FlexFuel holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: e85Cal has 35 ratings behind it against 1, so its average is the more settled of the two.
e85Cal ships an update every 4 months, KTuner FlexFuel daily. The most recent releases landed on July 23, 2026 and August 19, 2026 respectively.
| Parameter | e85Cal | KTuner FlexFuel |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (35 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 81.8% of reviews | — |
| Number of ratings | 35 — better | 1 |
| Update frequency | Every 4 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.1 | 11.0 — better |
| Further details — not scored | ||
| Size | 15 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Michael Joe | Peter Linszter |
Customer experience
e85Cal
KTuner FlexFuel
In-app purchases
e85Cal
No in-app purchases
KTuner FlexFuel
No in-app purchases
