Comparison

E85 Calculator vs APR PCU

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

APR PCU

Features
Read full description

The APR Power Control Unit (PCU) is an inline tuning box designed to increase the horsepower and torque of the vehicle! The plug-and-play control unit piggybacks off the primary Engine Control Unit (ECU) to deliver more boost, fuel, and timing to increase output. Using your smart phone or the optional wireless controller, you can change performance levels on the fly, revert to stock, adjust throttle sensitivity levels, read emissions readiness, read and clear fault codes, and more.

Screenshots

E85 Calculator2 screens
APR PCU4 screens

Verdict

The call

The clearest difference is update cadence: APR PCU at every 5 months against E85 Calculator's every 29 months. On price, ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

E85 Calculator ships an update every 29 months, APR PCU every 5 months. The most recent releases landed on November 1, 2026 and October 4, 2026 respectively.

Scorecard1 real difference · 9 level
E85 Calculator versus APR PCU: the parameters behind the verdict, then further details
ParameterE85 CalculatorAPR PCU
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews25.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 29 monthsEvery 5 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.015.0 — better
Further details — not scored
Size3 MB141 MB
Age rating4+4+
DeveloperSheharyar IrfanHolley Performance Products

In-app purchases

None

E85 Calculator

No in-app purchases

None

APR PCU

No in-app purchases

Questions

Is E85 Calculator free?
E85 Calculator is free to download, with no in-app purchases.
Is APR PCU free?
APR PCU is free to download, with no in-app purchases.
Do E85 Calculator or APR PCU have ads?
Neither E85 Calculator nor APR PCU shows ads.
Which is updated more often, E85 Calculator or APR PCU?
E85 Calculator ships an update every 29 months, and APR PCU every 5 months. Most recently, E85 Calculator was updated on November 1, 2026 and APR PCU on October 4, 2026.

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