Ev Efficiency

{
  "annualEnergyCost": 538,
  "annualKwh": 3360,
  "annualSavingsVsGas": 862,
  "asOf": "2026-10-11T14:38:37.138Z",
  "breakEvenElectricityPricePerKwh": 0.4167,
  "costPerMile": 0.0448,
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "gasAnnualCost": 1400,
  "gasCostPerMile": 0.1167,
  "kmPerKwh": 5.7477,
  "kwhPer100Km": 17.398,
  "kwhPer100Miles": 28,
  "kwhPerGallonEquivalent": 33.705,
  "milesPerKwh": 3.5714,
  "mpge": 120.38,
  "notChecked": [
    "real-world range: speed, cold weather, climate control, wheels, load and battery age cut range by 10 to 40%",
    "charging losses (about 10% from wall to battery; see /ev-charging)",
    "…2 more"
  ],
  "rangeKm": 431.1,
  "rangeMiles": 267.9,
  "reasons": [
    "MPGe = miles per kWh x 33.705 (EPA: one gallon of gasoline holds the energy of 33.705 kWh).",
    "1 mile = 1.609344 km."
  ],
  "source": "computed locally",
  "summary": "3.571 miles per kWh = 28 kWh per 100 miles = 174 Wh per km = 120.4 MPGe. A 75 kWh battery goes about 267.9 miles (431.1 km). At 0.16 per kWh that is 0.0448 per mile, 538 a year for 12000 miles. The ga…",
  "verdict": "COMPUTED",
  "whPerKm": 173.98
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://automotive-calc.x402tookit.com/ev-efficiency?batteryKwh=75&efficiency=28&gasMpg=30&gasPricePerGallon=3.5&pricePerKwh=0.16&unit=kwh_per_100mi'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://automotive-calc.x402tookit.com/ev-efficiency?batteryKwh=75&efficiency=28&gasMpg=30&gasPricePerGallon=3.5&pricePerKwh=0.16&unit=kwh_per_100mi' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fautomotive-calc.x402tookit.com%2Fev-efficiency
const res = await pay("https://automotive-calc.x402tookit.com/ev-efficiency?batteryKwh=75&efficiency=28&gasMpg=30&gasPricePerGallon=3.5&pricePerKwh=0.16&unit=kwh_per_100mi");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://automotive-calc.x402tookit.com/ev-efficiency?batteryKwh=75&efficiency=28&gasMpg=30&gasPricePerGallon=3.5&pricePerKwh=0.16&unit=kwh_per_100mi")
    print(res.status_code, res.text)