{"updated": "2026-10-17", "version": "2026-09-28", "title": "ガソリン代の計算（距離×燃費×都道府県別の週次単価）", "how": "計算は GET /api/gasoline-cost?km=30&kmpl=15&pref=13&fuel=regular&roundtrip=1&per_month=20 か、MCP の道具 gasoline_cost。画面は /now/gasoline/keisan/。単価の台帳は /api/now/prices.json", "survey_date": "2026-10-13", "national_regular": 170.1, "sources": [{"name": "資源エネルギー庁 石油製品価格調査（給油所小売価格・週次・都道府県別）", "url": "https://www.enecho.meti.go.jp/statistics/petroleum_and_lpgas/pl007/results.html"}, {"name": "国土地理院 地理院タイル（淡色地図）と住所検索", "url": "https://maps.gsi.go.jp/development/ichiran.html"}, {"name": "OSRM（OpenStreetMap の道路データによる経路計算・FOSSGIS の公開サーバー）", "url": "https://routing.openstreetmap.de/about.html"}, {"name": "KUON GEO /api/here（位置から自治体と都道府県）", "url": "https://kuongeo.com/api/here?lat=35.68&lon=139.76"}, {"name": "国税庁 タックスアンサー No.2585 マイカー・自転車通勤者の通勤手当（非課税限度額・令和8年4月1日現在法令等）", "url": "https://www.nta.go.jp/taxes/shiraberu/taxanswer/gensen/2585.htm"}, {"name": "日本年金機構 厚生年金保険の保険料（通勤手当は標準報酬月額に含む）", "url": "https://www.nenkin.go.jp/service/kounen/hokenryo/hoshu/20150515-01.html"}, {"name": "zipcloud 郵便番号検索 API（日本郵便の郵便番号データ）", "url": "https://zipcloud.ibsnet.co.jp/doc/api"}], "fetched": "2026-09-28", "license": "CC BY 4.0（数字）", "grid_national_regular": [{"km": 10, "kmpl": {"10": 170, "15": 113, "20": 85, "25": 68}}, {"km": 20, "kmpl": {"10": 340, "15": 227, "20": 170, "25": 136}}, {"km": 30, "kmpl": {"10": 510, "15": 340, "20": 255, "25": 204}}, {"km": 50, "kmpl": {"10": 851, "15": 567, "20": 425, "25": 340}}, {"km": 100, "kmpl": {"10": 1701, "15": 1134, "20": 851, "25": 680}}, {"km": 200, "kmpl": {"10": 3402, "15": 2268, "20": 1701, "25": 1361}}, {"km": 300, "kmpl": {"10": 5103, "15": 3402, "20": 2552, "25": 2041}}, {"km": 500, "kmpl": {"10": 8505, "15": 5670, "20": 4253, "25": 3402}}], "pref_100km_kmpl15": [{"code": "04", "name": "宮城県", "price": 163, "yen100": 1087}, {"code": "23", "name": "愛知県", "price": 163.7, "yen100": 1091}, {"code": "11", "name": "埼玉県", "price": 165, "yen100": 1100}, {"code": "03", "name": "岩手県", "price": 165.1, "yen100": 1101}, {"code": "08", "name": "茨城県", "price": 165.9, "yen100": 1106}, {"code": "28", "name": "兵庫県", "price": 165.9, "yen100": 1106}, {"code": "30", "name": "和歌山県", "price": 167, "yen100": 1113}, {"code": "36", "name": "徳島県", "price": 166.9, "yen100": 1113}, {"code": "02", "name": "青森県", "price": 167.1, "yen100": 1114}, {"code": "12", "name": "千葉県", "price": 167.2, "yen100": 1115}, {"code": "19", "name": "山梨県", "price": 167.7, "yen100": 1118}, {"code": "29", "name": "奈良県", "price": 167.7, "yen100": 1118}, {"code": "41", "name": "佐賀県", "price": 167.9, "yen100": 1119}, {"code": "14", "name": "神奈川県", "price": 168.4, "yen100": 1123}, {"code": "24", "name": "三重県", "price": 168.6, "yen100": 1124}, {"code": "33", "name": "岡山県", "price": 168.6, "yen100": 1124}, {"code": "35", "name": "山口県", "price": 168.6, "yen100": 1124}, {"code": "34", "name": "広島県", "price": 168.7, "yen100": 1125}, {"code": "43", "name": "熊本県", "price": 168.9, "yen100": 1126}, {"code": "09", "name": "栃木県", "price": 169.1, "yen100": 1127}, {"code": "17", "name": "石川県", "price": 169.1, "yen100": 1127}, {"code": "05", "name": "秋田県", "price": 169.2, "yen100": 1128}, {"code": "13", "name": "東京都", "price": 169.3, "yen100": 1129}, {"code": "21", "name": "岐阜県", "price": 169.6, "yen100": 1131}, {"code": "38", "name": "愛媛県", "price": 170.1, "yen100": 1134}, {"code": "37", "name": "香川県", "price": 170.3, "yen100": 1135}, {"code": "40", "name": "福岡県", "price": 170.2, "yen100": 1135}, {"code": "10", "name": "群馬県", "price": 170.5, "yen100": 1137}, {"code": "27", "name": "大阪府", "price": 170.6, "yen100": 1137}, {"code": "16", "name": "富山県", "price": 171.2, "yen100": 1141}, {"code": "22", "name": "静岡県", "price": 171.2, "yen100": 1141}, {"code": "07", "name": "福島県", "price": 171.3, "yen100": 1142}, {"code": "25", "name": "滋賀県", "price": 171.4, "yen100": 1143}, {"code": "01", "name": "北海道", "price": 171.7, "yen100": 1145}, {"code": "15", "name": "新潟県", "price": 171.7, "yen100": 1145}, {"code": "44", "name": "大分県", "price": 171.8, "yen100": 1145}, {"code": "26", "name": "京都府", "price": 173, "yen100": 1153}, {"code": "45", "name": "宮崎県", "price": 173.8, "yen100": 1159}, {"code": "18", "name": "福井県", "price": 174, "yen100": 1160}, {"code": "39", "name": "高知県", "price": 174.3, "yen100": 1162}, {"code": "32", "name": "島根県", "price": 174.9, "yen100": 1166}, {"code": "31", "name": "鳥取県", "price": 176.1, "yen100": 1174}, {"code": "20", "name": "長野県", "price": 176.3, "yen100": 1175}, {"code": "42", "name": "長崎県", "price": 177.1, "yen100": 1181}, {"code": "46", "name": "鹿児島県", "price": 177.3, "yen100": 1182}, {"code": "06", "name": "山形県", "price": 177.5, "yen100": 1183}, {"code": "47", "name": "沖縄県", "price": 179.2, "yen100": 1195}], "tsukin_tax_free_limits": {"source": "国税庁 タックスアンサー No.2585 マイカー・自転車通勤者の通勤手当", "url": "https://www.nta.go.jp/taxes/shiraberu/taxanswer/gensen/2585.htm", "asof": "令和8年4月1日現在法令等", "unit": "JPY/month", "by_oneway_km": [{"from_km": 0, "to_km_exclusive": 2, "limit": 0}, {"from_km": 2, "to_km_exclusive": 10, "limit": 4200}, {"from_km": 10, "to_km_exclusive": 15, "limit": 7300}, {"from_km": 15, "to_km_exclusive": 25, "limit": 13500}, {"from_km": 25, "to_km_exclusive": 35, "limit": 19700}, {"from_km": 35, "to_km_exclusive": 45, "limit": 25900}, {"from_km": 45, "to_km_exclusive": 55, "limit": 32300}, {"from_km": 55, "to_km_exclusive": 65, "limit": 38700}, {"from_km": 65, "to_km_exclusive": 75, "limit": 45700}, {"from_km": 75, "to_km_exclusive": 85, "limit": 52700}, {"from_km": 85, "to_km_exclusive": 95, "limit": 59600}, {"from_km": 95, "to_km_exclusive": null, "limit": 66400}], "parking_max": 5000, "toll_total_max": 150000, "page": "https://kurashigram.com/now/gasoline/tsukin/"}, "rate_per_km": "会社の規定の1kmあたりの単価で計算するときは GET /api/gasoline-cost?km=30&rate_per_km=15&roundtrip=1&per_month=20", "note": "距離÷燃費×単価、または距離×1km単価。単価は資源エネルギー庁の週次の県平均。計算で埋めない。高速代や維持費は含まない"}