e85Cal vs RENNtech HSM
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.
RENNtech HSM
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An application used to control the Bluetooth version of the RENNtech Hand-held Suspension Module (HSM-BLE - RENNtech PN 32.971.8001). This application will allow you to change the ride-height of your Airmatic or ABC Suspension Mercedes using the RENNtech HSM-BLE device. Save up to three different profiles for quick access to your favorite ride-height settings. Please note that this application is not compatible with RENNtech HSM PN 32.222.6001.
Screenshots
Verdict
The clearest difference is iOS requirement: e85Cal at 12.1 against RENNtech HSM's 16.0. On price, update cadence, ads and in-app purchases 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.
e85Cal ships an update every 4 months, RENNtech HSM every 3 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | e85Cal | RENNtech HSM |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (37 ratings) — better | — |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 37 — better | — |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 15 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Michael Joe | Dian Esterhuyse |
In-app purchases
e85Cal
No in-app purchases
RENNtech HSM
No in-app purchases
