{"updated": "2026-09-27", "version": "2026-09-26", "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": "2026-09-14", "national_regular": 169.9, "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"}], "fetched": "2026-09-26", "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": 850, "15": 566, "20": 425, "25": 340}}, {"km": 100, "kmpl": {"10": 1699, "15": 1133, "20": 850, "25": 680}}, {"km": 200, "kmpl": {"10": 3398, "15": 2265, "20": 1699, "25": 1359}}, {"km": 300, "kmpl": {"10": 5097, "15": 3398, "20": 2549, "25": 2039}}, {"km": 500, "kmpl": {"10": 8495, "15": 5663, "20": 4248, "25": 3398}}], "pref_100km_kmpl15": [{"code": "04", "name": "宮城県", "price": 163.2, "yen100": 1088}, {"code": "23", "name": "愛知県", "price": 163.4, "yen100": 1089}, {"code": "11", "name": "埼玉県", "price": 164.1, "yen100": 1094}, {"code": "03", "name": "岩手県", "price": 164.6, "yen100": 1097}, {"code": "36", "name": "徳島県", "price": 165.9, "yen100": 1106}, {"code": "08", "name": "茨城県", "price": 166.1, "yen100": 1107}, {"code": "28", "name": "兵庫県", "price": 166.2, "yen100": 1108}, {"code": "41", "name": "佐賀県", "price": 166.3, "yen100": 1109}, {"code": "12", "name": "千葉県", "price": 166.8, "yen100": 1112}, {"code": "02", "name": "青森県", "price": 167.3, "yen100": 1115}, {"code": "29", "name": "奈良県", "price": 167.3, "yen100": 1115}, {"code": "30", "name": "和歌山県", "price": 167.2, "yen100": 1115}, {"code": "35", "name": "山口県", "price": 167.6, "yen100": 1117}, {"code": "19", "name": "山梨県", "price": 168.1, "yen100": 1121}, {"code": "24", "name": "三重県", "price": 168.2, "yen100": 1121}, {"code": "14", "name": "神奈川県", "price": 168.3, "yen100": 1122}, {"code": "34", "name": "広島県", "price": 168.4, "yen100": 1123}, {"code": "13", "name": "東京都", "price": 168.6, "yen100": 1124}, {"code": "33", "name": "岡山県", "price": 168.8, "yen100": 1125}, {"code": "09", "name": "栃木県", "price": 168.9, "yen100": 1126}, {"code": "05", "name": "秋田県", "price": 169.1, "yen100": 1127}, {"code": "17", "name": "石川県", "price": 169, "yen100": 1127}, {"code": "40", "name": "福岡県", "price": 169.2, "yen100": 1128}, {"code": "43", "name": "熊本県", "price": 169.2, "yen100": 1128}, {"code": "38", "name": "愛媛県", "price": 169.3, "yen100": 1129}, {"code": "21", "name": "岐阜県", "price": 169.8, "yen100": 1132}, {"code": "37", "name": "香川県", "price": 170, "yen100": 1133}, {"code": "10", "name": "群馬県", "price": 170.4, "yen100": 1136}, {"code": "27", "name": "大阪府", "price": 170.5, "yen100": 1137}, {"code": "01", "name": "北海道", "price": 170.9, "yen100": 1139}, {"code": "16", "name": "富山県", "price": 171.1, "yen100": 1141}, {"code": "22", "name": "静岡県", "price": 171.5, "yen100": 1143}, {"code": "25", "name": "滋賀県", "price": 171.5, "yen100": 1143}, {"code": "07", "name": "福島県", "price": 171.8, "yen100": 1145}, {"code": "15", "name": "新潟県", "price": 171.7, "yen100": 1145}, {"code": "26", "name": "京都府", "price": 172.6, "yen100": 1151}, {"code": "44", "name": "大分県", "price": 172.6, "yen100": 1151}, {"code": "18", "name": "福井県", "price": 174, "yen100": 1160}, {"code": "45", "name": "宮崎県", "price": 174.1, "yen100": 1161}, {"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": 175.8, "yen100": 1172}, {"code": "20", "name": "長野県", "price": 176.6, "yen100": 1177}, {"code": "46", "name": "鹿児島県", "price": 177.1, "yen100": 1181}, {"code": "06", "name": "山形県", "price": 177.7, "yen100": 1185}, {"code": "42", "name": "長崎県", "price": 179.5, "yen100": 1197}, {"code": "47", "name": "沖縄県", "price": 180.4, "yen100": 1203}], "note": "距離÷燃費×単価。単価は資源エネルギー庁の週次の県平均。推定なし。高速代や維持費は含まない"}