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2003.12.24

(今度は本当に)燃料の話。

私のような欧州車乗りの中では(一部の車種を除いて)常識とされていることがある。使用燃料はハイオク(プレミアム)指定、ということです。これは、欧州のガソリン規格と日本のガソリン規格が若干異なることに由来する。

             日本    欧州(西欧)
レギュラー       91     91(Benzine:商用車向け)
乗用レギュラー    無し    95(Super)
ハイオク        98~100  98(SuperPlus)
ウルトラプレミアム  特に無し  98~100 
                    (ドイツ:V-power/ 
                    イギリス:Optimax shellの商標)
有鉛ハイオク     禁止    95~98 
                    (フランスとイギリス:禁止の方向 
                     LRPgasで代替)

以上の表のように、普通のガソリン乗用車(触媒つき)を買うとSuper95が指定されている。よって、日本のレギュラーではちょっとオクタン価が足りないのでハイオクを入れれば大丈夫というわけ。現状、日本ではすべてのメーカーが100オクタンなので、安心して給油できる。

んで、ずっと欧州車に乗ってきたわけだが、今まではとりあえずハイオクさえ入れてあれば何も問題なかった。(ちなみにGolfIIIで試しにレギュラー入れたらちっとも走らなくなった。金が無くても止めましょう。)

しかし・・・こんどのR32号は当然ハイオク入れているのに、ブランド・銘柄・SSで加速フィールがずいぶん違うことに気付き始めた。今までそんなものプラセボ(気のせい)だと思っていたのだが、実際に明らかに違いがある。まあ、圧縮比11を越える可変バルブ付きエンジンなので燃料には敏感なのだろうか。

ブランドの違いを検証するためにN=3の満タン法で給油SSも変えて、入手容易な銘柄を3種試してみた。(SSの品質による差異を除くため、全部別SS・別地域で比べてみました)
結果:
昭和シェル「Pura」   一番加速感がいい。燃調が濃いときに 
              起こりやすいアクセル抜き側の「ンボボ」 
              も減った。かなりスムーズな加速感。 
ENEOS「ヴィーゴ」   可もなく不可もなくパーシャルスロットル 
              は一番滑らか。長距離は楽かも。 
              ただし燃費は一番良いような気がする。 
Esso/Mobil「Synagy」 アイドリング時のボボボも大きく吹け残り、 
              燃調が濃い様子。低速で引っかかる感じ。

Esso/Mobil/General(ExxonMobil系)はセルフが安くて気に入ってたんだけど、ちょっと残念な結果に。

あと試さなければいけないのは出光とコスモ、Jomoですかね。

こうなってくると、オクタン価だけが指標とは言えない気がしてきた。
ガソリンの製造工程でいろんな分子構造のものをブレンドしてベースを作り、昨今はさらに添加剤を入れている<ガソリンの製法・中身の詳細はここを参照のこと>ので、何かの成分が銘柄ごとに微妙に違うわけだ。んなわけで、前出の欧州でもウルトラプレミアムガソリンが登場してくるという背景もあるんですね。欧州の超高性能車は燃料まで推奨があったりするようですから。R32に効いてもあながち嘘じゃなさそう。

とりあえず、私の予備実験レベルでは調子のよかった
シェルPuraを今のところの常用燃料にしておこう。

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Comments

私は基本的にShell Pulaを入れ続けています。
アクセル戻した時の音はしてますね。
他メーカは試すとしても出光かなぁ。
Shellはセルフで割と安く入れられるので気軽に使ってます。
スターレックスカードも作ってしまったんで逆に入れまくらないと損かも。

Posted by: irikura | 2003.12.24 06:30 AM

初めましてKIYOです.R32銀2ドアです.
10以上前に「出光はオクタン価が高い」という噂を聞いてからどの車でも出光でしか入れたことがありません.地方では出光でも中身が出光かどうかわかりませんが... 自分の車で他のブランドのガソリンと比較したことがないのですが,ンボボはあまり経験したことがありません.アイドルのボボボも感じません.静かな車だなと思っています.
6速80キロ上り坂とかではこもる音がしますが.

Posted by: KIYO | 2003.12.28 11:10 AM

どうも、書き込みありがとうございます。
>irikuraさん、
近所にShellのセルフあるんですねぇ、いいなあ。
うちの周りはEneosだらけです。うーん、どこも高い・・・。
厚木まで足を伸ばせば選びたい放題あるんですけれど。

>KIYOさん、
こちらでははじめまして、ようこそ。

昔はそういう話しもありましたよね、出光の100。日石は高価なアルキレートガソリンを添加してオクタン価競争になったりとか。Shellが最後まで98オクタンでしたね。そのころ、Jomo(旧共石)はオクタン価の高いエーテル系基材の添加を最初に手がけたと記憶しているのですが、このMTBE自体が最近は環境汚染物質に指定されるので米国では禁止されているそうです。10年一昔ってやつですか。

Posted by: lucifer | 2003.12.28 12:38 PM

自己Resれっす(^^;;

出光スーパーゼアス、試してみました。
例によって別地域・別SSで3回給油(川崎・練馬・市川)です。

うーん、いいかも。
2速発進でちょっと早めにクラッチ離してしまったような時もどどっと回転下がったときの引っ掛かりが無い。元々そんな負荷ぐらいではノッキングなど起こさないほど優秀なエンジンなのですが、さらに扱いやすくなるって感じかな?

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