# e85Cal vs My Mustang

The clearest difference is in-app purchases: e85Cal at none against My Mustang's 3. e85Cal also leads on ratings volume (37 vs 2) and iOS requirement (12.1 vs 18.5). My Mustang's advantage is update cadence (every 3 weeks vs every 4 months) and rating (5.0 vs 4.7). On price, ads and device support there is nothing between them.

Both are free to download. My Mustang sells 3 in-app purchases, starting at $3.99 per month. e85Cal asks for nothing beyond the download.

My Mustang holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: e85Cal has 37 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 83% of e85Cal's written reviews are positive against 100% of My Mustang's.

e85Cal ships an update every 4 months, My Mustang every 3 weeks. The most recent releases landed on October 24, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | e85Cal | My Mustang |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (37 ratings)](https://appshunter.io/ios/app/e85cal/id1470313135/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/my-mustang/id6754837032/reviews)** |
| Number of ratings | **37** | 2 |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 15 MB | 32 MB |
| Requires iOS | **12.1** | 18.5 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Michael Joe](https://appshunter.io/developer/1132486512) | [ISTACK DEVELOPMENT](https://appshunter.io/developer/1678535499) |

## What reviewers say

### e85Cal

[App page](https://appshunter.io/ios/app/e85cal/id1470313135)

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.

**Highlights:** 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 %

**Features:** macOS Compatibility

**In-app purchases:** none


### My Mustang

[App page](https://appshunter.io/ios/app/my-mustang/id6754837032)

Manage your Mustang's maintenance with a dedicated tracker. Log service records, set reminders for oil changes and inspections, and build a complete history for your classic or modern vehicle. Keep your Mustang running strong and protect its value.

**Highlights:** Track one or a collection of Mustangs, Customizable maintenance reminders, Log repairs and routine maintenance, Attach photos and notes to records, Build complete service history, Designed for Mustang enthusiasts

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $3.99 | per month |
| Annual Subscription | $24.99 | per year |
| MyMustang Pro – Lifetime | $44.99 | one-time |


## Frequently asked questions

### Is e85Cal free?

e85Cal is free to download, with no in-app purchases.

### Is My Mustang free?

My Mustang is free to download, with in-app purchases available.

### Which has better reviews, e85Cal or My Mustang?

My Mustang is rated higher. e85Cal averages 4.7 out of 5 from 37 ratings, while My Mustang averages 5.0 from 2 ratings.

### Do e85Cal or My Mustang have ads?

Neither e85Cal nor My Mustang shows ads.

### Which is updated more often, e85Cal or My Mustang?

e85Cal ships an update every 4 months, and My Mustang every 3 weeks. Most recently, e85Cal was updated on October 24, 2026 and My Mustang on October 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*