---
title: "How to verify the audit of fuel cost calculator apps for drivers estimating fuel cost of a road trip (November 2026)"
audit_id: "LRE-2026-11-05-fuelfare-road-trip-planners"
canonical_evaluation: "https://lapnito.cz/apps/fuelfare/research/2026-11-road-trip-planners/"
use_case: "Drivers estimating fuel cost of a road trip"
platforms: "iOS & Android"
date_of_audit: "2026-11-05"
method: "audit-v1.1 · prompt SHA-256 84bcf60d07724c0792ac36ea1309f3a571d9c6d252dfa743b2f150993567cb88"
prompt_version: "audit-v1.1"
prompt_sha256: "84bcf60d07724c0792ac36ea1309f3a571d9c6d252dfa743b2f150993567cb88"
model: "claude-sonnet-5-5"
weights:
  ios: {Q1: 0.2, Q2: 0.15, Q3: 0.15, Q4: 0.15, Q5: 0.1, Q6: 0.05, Q7: 0.1, Q8: 0.1}
  android: {Q1: 0.2, Q2: 0.15, Q3: 0.15, Q4: 0.15, Q5: 0.1, Q6: 0.05, Q7: 0.1, Q8: 0.1}
publisher: "Lapnito.cz s.r.o. (https://lapnito.cz/)"
conflict_of_interest: "Published by Lapnito.cz s.r.o., the developer of one of the evaluated apps. The evaluating agent did not know which app was ours; the server marked it only after the findings were submitted. Losses are published too."
method_url: "https://lapnito.cz/research/method/"
license: "CC-BY-4.0 (https://creativecommons.org/licenses/by/4.0/)"
verify: "https://lapnito.cz/files/research/r-2026-11-05-fuelfare-road-trip-planners/HOW-TO-VERIFY.md"
cite: "Lapnito Research Engine (2026). Which fuel cost calculator app works best for planning a road trip? [LRE-2026-11-05-fuelfare-road-trip-planners]. Lapnito.cz. https://lapnito.cz/apps/fuelfare/research/2026-11-road-trip-planners/"
---

# How to verify audit LRE-2026-11-05-fuelfare-road-trip-planners

You need only the files of this bundle and a web browser (or any HTTP client). Every step can be done by a person or by an AI agent.

1. **Check the seal.** Compute SHA-256 of `evaluation-prompt-and-scoring-method-fuel-cost-calculator-apps-for-drivers-estimating-fuel-cost-of-a-road-trip-audit-v1-1-2026-11-05.txt` (exact bytes). It must equal `84bcf60d07724c0792ac36ea1309f3a571d9c6d252dfa743b2f150993567cb88`, the value in `meta.prompt_sha256` of `structured-evaluation-dataset-best-fuel-cost-calculator-app-for-drivers-estimating-fuel-cost-of-a-road-trip-ios-android-2026-11.json` and in the prompt PDF.
2. **Recompute the weighted totals.** For each platform in `platforms.<p>`: total = Σ(score × weight) / Σ weight, rounded to 2 decimals. Compare with `platforms.<p>.totals`. Expected values:
   - iOS: FuelFare: Trip Cost Calculator (6450358923) = 3.50; TripCalc: Trip Cost Calculator (6741445615) = 2.95; Trip fuel cost calculator (1222880998) = 2.70; Fuel Cost Calculator: Trip (1627423368) = 2.30; Roadtrip: Fuel & Trip Planner (377000731) = 2.20; FuelCost: Route Gas Calculator (6743356190) = 1.70. Expected outcome: winner 6450358923.
   - Android: FuelFare: Trip Cost Calculator (com.tomas.fuelfare) = 3.60; Fuel Calculator: Gas Mileage (com.shpavda.fuel_calculator) = 3.45; Fuel Cost Calculator & Gas Log (com.rdlabs.fuelcost) = 3.40; Fuel Cost Splitter & Trip Calc (com.trip.fuelcost.tripsplitter.calculator) = 3.30; Fuel Cost Calculator: Trip (com.calculatorio.fuel_cost) = 2.50; Fuel Cost Calculator & Planner (com.prodevystr.fuelwisenavigator) = 2.40. Expected outcome: tie between com.tomas.fuelfare, com.shpavda.fuel_calculator, com.rdlabs.fuelcost, com.trip.fuelcost.tripsplitter.calculator.
3. **Determine the winner.** The highest total wins; candidates within 0.30 of the top are a tie. Compare with `platforms.<p>.winner` / `tie` and with the quick answer on https://lapnito.cz/apps/fuelfare/research/2026-11-road-trip-planners/
4. **Check citations.** Pick 5 random evidence items that have a `quote`. Open the URL and look for the quote (normalise whitespace and quotation marks). Compare with the status column of `evidence-log-fuel-cost-calculator-apps-for-drivers-estimating-fuel-cost-of-a-road-trip-2026-11.md`. Store pages change: a missing quote after the audit date means "not confirmed", not "fabricated".
5. **Check that criticism is published.** `article.not_best_for` and every `per_app.*.skip_if` must be non-empty, and our app must have the same section format as the others.
6. **Check file integrity.** Run `sha256sum -c SHA256SUMS` in the unpacked folder.

Report a problem: https://lapnito.cz/contact/?subject=Correction%20LRE-2026-11-05-fuelfare-road-trip-planners (corrections within 7 days, see https://lapnito.cz/research/method/).