E85 Calculator vs PROFLEX Connect
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
E85 Calculator
This application helps performance enthusiasts and flex-fuel vehicle owners precisely calculate the amounts of E85 and gasoline needed for specific ethanol percentages or octane ratings. It offers both simple and advanced modes for fuel mixing calculations, supporting metric and imperial units.
- Calculate E85 and gasoline amounts
- Target specific ethanol percentages
- Calculate by desired octane rating
- Metric and imperial unit support
- Real-time calculations
- Easy and advanced modes
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E85 Calculator is your essential tool for precision fuel mixing, designed for performance enthusiasts and flex-fuel vehicle owners. KEY FEATURES: - Calculate exact amounts of E85 and gasoline needed - Target specific ethanol percentages (E30, E50, E70, E85) - Calculate by desired octane rating - Support for both metric (liters) and imperial (gallons) units - Real-time calculations with instant updates - Easy and advanced modes for different user needs EASY MODE: - Quick presets for common ethanol targets - Simple tank size selection - Intuitive slider controls for current fuel level - Basic inputs for everyday use ADVANCED MODE: - Precise control over fuel properties - Custom octane ratings input - Detailed ethanol content adjustment - Advanced fuel mixing calculations Perfect for: - Flex-fuel vehicle owners - Performance car enthusiasts - Race car tuners - Anyone mixing E85 with regular gas Get accurate calculations every time and achieve the perfect fuel blend for your vehicle's needs. Whether you're targeting a specific ethanol percentage or octane rating, E85 Calculator provides the precise measurements you need. Safe, simple, and accurate - take the guesswork out of fuel mixing with E85 Calculator.
PROFLEX Connect
This app allows you to monitor your vehicle's fuel system performance in real-time. It displays device settings and helps locate nearby E85 fuel stations for convenient ethanol blending.
- Real-time device setting display
- E85 station locator
- Fuel ratio monitoring
- Performance flex fuel system integration
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PROFLEX Commander is a bolt on performance flex fuel system allowing your vehicle to make big power with ethanol right out of the box. No tuning needed. The PROFLEX Commander and FLEXLINK family of devices allow you to run any blend of gas and E85 at anytime, while always delivering the exact fuel ratio to your vehicle. The PROFLEX Connect app allows you to view your device settings in real-time, and even help you find a nearby e85 station.
Screenshots
Verdict
The clearest difference is rating: PROFLEX Connect at 2.8 against E85 Calculator's 1.0. PROFLEX Connect also leads on update cadence (weekly vs every 29 months) and ratings volume (56 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.
PROFLEX Connect holds the better App Store score, 2.8 against 1.0. That said, the two scores are not equally well evidenced: PROFLEX Connect has 56 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 25% of E85 Calculator's written reviews are positive against 38% of PROFLEX Connect's.
E85 Calculator ships an update every 29 months, PROFLEX Connect weekly. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | E85 Calculator | PROFLEX Connect |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 2.8 (56 ratings) — better |
| Positive reviews | 25.0% of reviews | 37.9% of reviews — better |
| Number of ratings | 1 | 56 — better |
| Update frequency | Every 29 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 12.4 — better |
| Further details — not scored | ||
| Size | 3 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Sheharyar Irfan | ADVANCED FUEL DYNAMICS |
Customer experience
E85 Calculator
PROFLEX Connect
In-app purchases
E85 Calculator
No in-app purchases
PROFLEX Connect
No in-app purchases
