What is that in dollars? about $300/year cheaper. Extrapolated further we see $1500 savings after 5 years and $3000 after 10. Are those few extra hp really worth this cost?
Of course the actual figures will vary widely based upon how many miles one drives (the more one drives the bigger the savings become) but I like the way you look at the long term picture.
One of the oldest tricks in the book is to break down costs by the month to make them seem less significant. Even the American hero Benjamin Franklin did this when he was trying to convince the early American colonists to subscribe to worthy public projects such as a city hospital or to raise funds for the defense of the colony to purchase cannons, guns and other supplies to equip volunteers for common defense or a library so the residents who, singly, could only afford a book or two could obtain a wide variety of knowledge compiled by the modern authors of the day and thus, improve their lives. He would even break down the monthly subscription cost to the cost per day in an effort to make the cost sound affordable. In this way he greatly improved the lives of early Americans.
However, in personal financial affairs, Franklin was hugely instrumental in instilling thrift, as a means to wealth and a good life, in the early American populace. He did this primarily through his immensely well read Poor Richards Almanac which he published every year for many years. Americans loved it and the great effect it had on early America cannot be over emphasized. The very success of the American Revolution may not have been possible without this embedded wisdom. Pithy expressions such as "A penny saved is a penny earned" and "Early to bed and early to rise makes a man healthy, wealthy and wise" would embed themselves in the American psych and be handed down for generations to come. He was adamant in his advice to avoid personal debt, the only exception being land which was cheap in the day and could be worked to secure a good income. Unfortunately, his wise advice is eroding with time. Franklin himself became a very wealthy man. Born poor, he did not do this through inheritance or charging high prices to people who were desperate, but by reducing his personal expenses to the bare minimum and working diligently, providing needed goods and services, saving as much as possible through the years. He started this path of thrift and saving and investing early in life and, even though hard money was extremely scarce in those days, through steady persistence he became quite wealthy by age 40 and by age 50 he was truly a man of power and influence and his finances strong enough he could devote his life to causes dear to his heart without worry of where the next dollar would come from. If not for Benjamin Franklin and the fact that he had free time in his later years to devote to the cause of the American Revolution, Americans to this day might still be British subjects, subservient to the King. The secret to personal freedom is tightly controlling the balance between the income and the expense and the best way to do this is have an eagle eye on the expense side of the ledger.
Unfortunately, now the motto seems to be "Spend early, spend often, there will be more where that came from". Most Americans have so much debt they cannot imagine themselves ever debt free and think nothing of adding a little here and there (after all, I work hard and I deserve nice things, right?). I can afford it, never mind that my savings is in shambles. The best one is "no worries, it will add to the resale value, I am making the wise financial decision by upgrading to the most expensive trim level", LOL! These people will never be rich unless they inherit it from their daddy (and even then it will likely be gone long before they are in their graves).
Apologies for the long ramble but I do admire the diligence practiced by those who know the value of a dollar here, a dollar there, especially when practiced over the long term.