Last post on Dec 24, 2008 at 9:27 AM
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Hybrid Cars, Fuel Efficiency (MPG)
Hypermilers: Breaking the 100-MPG Barrier -Kelly is using one of the techniques of "hypermiling," the fine art of wringing the greatest fuel economy possible from a vehicle through a selection of clever driving techniques. The 100-mpg barrier is the elusive goal. (more)
Jun 13, 2008 (2:29 pm)
Before the Edmunds article, I'd never heard of hypermiling. After reading it, I decided to give it a try.
I had to make a trip from Colorado Springs to downtown Denver and back, 120 miles, almost exactly. I drive an '05 Focus auto tranny Sedan, and in the past I've averaged 28-32 city/hwy mixed driving.
The drive included a small pass (a climb from 7000-8000 ft.), so several long hills. There was also a lot of stop and go traffic in Denver. I cut down on AC usage, coasted on hills, and accelerated slowly. I also slowed down my average speed by about 5-10 mph.
I filled up back home when I had 119.9 miles on the trip ticker. I bought 2.5 gallons of gas. You can do the math, but that's nearly 48 mpg! I'm very excited about this discovery. Admittedly, perhaps not the most accurate measurement, but I'm guessing it was within a couple mpg's, which is still great for me. I'll definitely be using this in the future!
#45 of 48 not really hypermilling but...
Jun 16, 2008 (6:58 am)
I get good mileage because I drive reasonably. Conscience speaking, I am interested in being more environmentally friendly. I profess ignorance at my driving style's environmental effect...ie. idling. I live where it's hot and hormones require A/C. I take the bike whenever possible but which type of vehicle is best if I'm sitting around for 20 minutes waiting for my child to get out of school. I drive less than 10K a year, mostly stop and go in town. Should I be most worried with CO2 emissions??
Thanks for considering this question. I have looked everywhere and can't figure out with the idling problem. A year left on the lease, then I should buy?? a Prius??
#46 of 48 Re: not really hypermilling but... [pinerivergal]
Jun 16, 2008 (9:52 am)
Most any hybrid will address the "idling" problem. One of the key steps forward is that the Internal Combustion Engine does not run when not needed. However, they will probably need to run if your A/C load is that high (some have "economy" settings that will not let the engine to run just for the A/C but at the cost of some comfort).
Also stop and go is ideal for hybrids since the stopping recharges the battery through regenerative breaking, and the low speed go is almost purely electric. I often wonder with a long enough traffic jam if I could reach Miami (900 miles) on one tank (I've averaged 90mpg+ for as long as 20 minutes in traffic jams before in my Prius)
#47 of 48 79 mpg is easy in a Prius
Jul 14, 2008 (9:17 am)
Last Friday morning I made a 100 mile round trip in my 2005 Prius and got 71.5 mpg for the trip. I used high-speed limited access highways on the way out and back roads for the trip back. The trick is simple: I determined that my tires are rated for a maximum pressure of 44 psig, and I put them at that pressure. This reduced the rolling resistance significantly. The effect is most significant at lower speeds where the air resistance is relatively small. Thus I did less than 70 mpg on the outward portion of the trip and more than 70 mpg on the return.
The difference in the ride is noticeable but not objectionable. I expect that the tires will wear more unevenly than they would at the recommended pressures, but that effect may be less than one might expect due to the nature of the steel-belted radials.
I am extremely pleased with my Prius. I think the Edmunds review is too critical, although I can understand why they might want to be conservative. I especially like the ability to fold down the back seats to make the car into effectively a station wagon. I think Toyota has some work to do on the transition from regenerative braking to mechanical breaking, especially if the car was last driven on wet roads. The mechanical brakes can then grab, almost to the point of causing wheel lock. I have learned to drive a short distance at slow speed with the brakes on to dry them out before parking the car after a drive on wet roads.
Dec 24, 2008 (9:27 am)
Since we're WAY off the peak of gas prices in the summer, have you slacked off on your hypermiling habits?