Let me first state I think Phil Luciano is a great columnist, and I am always entertained by his writing style, and “get it” when it comes to Phil’s sense of humor. He’s damn good at what he does in the paper. But I take, shall we say, significant umbrage at yesterday’s baloney-filled column about speeding v. fuel economy.
Phil bought too far into the claims of his unnamed veteran cop “source” for this story.
This officer claims he’s surprised…I’m sorry, he said “flabbergasted”…that people are “still driving like maniacs” with fuel nearing $4.00 per gallon.
Excuse me, buddy, but I do NOT “drive like a maniac”, and just because one speeds he/she is not a “maniac”. So let’s cut the hyperbole here. To me, the “maniacs” are the a-holes who run stop signs, don’t use signals, change lanes without warning, accelerate through left-turn lane yellow- and red-lights, and follow other cars too damn close. THOSE are the “maniacs”, and those people don’t have to “speed” to be an idiot.
Beyond that, though, let’s examine the claims in the story and the math around them:
According to AAA Motor Club, Phil says, decreasing speed from 75 to 65 MPH increases fuel economy by 10%, and decreasing speed from 70 to 55 MPH increases fuel economy by 17%. First, simple math tells us that even if these claims are true (they’re not), they don’t make a lot of sense. A decrease from 75 to 65 MPH is a decrease of 14% (and an increase in time needed to arrive at the destination by that same 14%). Ever heard the phrase “time is money”? Well, in sales, it’s true. So to effectively increase my mileage by 10%, I’ve got to slow down 14% and waste more time driving. Not a good deal.
And the other example given is just as bad…to get a 17% claimed (again, not true) increase in mileage, I’ve got to slow down by 22%! In other words, my 100-minute drives back and forth to Canton everyday become 122 minutes, and I spend another one hour and forty minutes in just one week (that’s a LOT of time I could be working at my desk or making sales calls) driving my car back and forth, only to see my mileage (supposedly) increase.
But alas, it doesn’t work that way in all vehicles. Hell, it doesn’t work that way in any vehicles that I know of. Cars, like golf clubs, baseball bats, and numerous other man-made items, have a “sweet spot”. Each one is different. Some vehicles (mine, for instance) achieve peak gas mileage at higher speeds, because of the gearing and how it matches to the “sweet spot” for engine RPM.
After reading it yesterday, I did a little test this morning. I topped off my tank and headed up to I-80, where I zeroed out my trip computer and set the cruise at 70. My drive from Annawan to Ottawa netted 24.8 MPG according to GM’s uncannily accurate dashboard trip-computer that I’m happy my Grand Prix came with. On the way back, I topped off, zeroed out the CPU and set the cruise at 55. Yes, on I-80. No rush to get back. Same trip, same miles. According to Phil and the AAA Motor Club, I should have seen my mileage increase to 27.3 MPG. Um, no. Try 24.2 MPG. Yep, my car gets worse mileage at 55 than it does at 70 in the same conditions. (Okay, it was four degrees warmer, for you engineer types).