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Sedans Chevrolet Impala Chevrolet Impala Real World MPG
117 messages, Last post on Apr 15, 2009 at 11:28 AM
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I just finished a trip for the Thanksgiving holiday and set a new record for gas mileage with my SS. I would like to look at a topographical map to confirm my suspicions but I believe I'm gettng better mileage based on a overall down slope on the trip. I fill up at the same gas stations to and from my destination so I can gauge the difference in each direction of travel. Here are my results: Northbound legs 25.34 mpg/54.1 mph and 27.37 mpg/67.1 mph Southbound legs 29.33 mpg/69.7 mph22 and 22 mpg/64.1 mph I cheated a little on the 29.33 mpg leg by resetting the car's trip computer after I accelerated to cruising speed. However, the car's indicated fuel mileage was actually slightly lower at 27.7 mpg. I attribute part of this disparity to possibly filling the tank a little more prior to this leg. But, even if I added an extra half gallon at the end, which I know I couldn't have fit, the mileage would have only dropped to 28.7 mpg. The leg listed first is through fairly level terrain through SC, NC, and VA on I-26 and I-77. The leg listed second is through the mountains of VA and WV on I-77. These results are consistent with other trips I've taken over the same route. This is why I believe I may be seeing an overall result of uphill vs. downhill mileage over the course of the leg. It's pretty interesting, though, as my mileage has continued to improve as the car wears in. I now have about 29.5K on the odometer. Regardless, getting over 25 mpg, UPHILL, with a V-8 engine producing over 300 HP is damned impressive. One last note, I achieved these latest results on 87 octane...so maybe I was producing a little less than 300 HP. The lower octane doesn't seem to affect fuel economy so I plan to use it for the road trips from now on. 
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Replying to: quietpro (Nov 28, 2007 6:47 am) "I cheated a little on the 29.33 mpg leg by resetting the car's trip computer after I accelerated to cruising speed. However, the car's indicated fuel mileage was actually slightly lower at 27.7 mpg. I attribute part of this disparity to possibly filling the tank a little more prior to this leg. But, even if I added an extra half gallon at the end, which I know I couldn't have fit, the mileage would have only dropped to 28.7 mpg. " To calculate MPG one should simply divide the miles traveled by the amount of gallons on the receipt after the fill up. Using the computer won't give meaningful numbers. |
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Replying to: pulgo (Nov 28, 2007 8:12 am) You are assuming too much when you state that all that is required to calculate mileage is to divide the miles by gallons at fill up. Filling a fuel tank isn't an exact science since the cutoffs at various pumps will vary. Also, most people usually pump to an even dollar amount. You can never be certain you have filled your tank to the exact same posiiton everytime. That's why I go with averages to compensate for those variances. As I stated, I believe I pumped a little more fuel into the tank before that last leg than I did at the conclusion. That would give the impression that I achieved better fuel mileage than if I managed to squeeze an extra half gallon or so into the tank. I acknowledged that in the post (accounting for mileage if I were to calculate based on an extra half gallon of fuel).
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Replying to: quietpro (Nov 28, 2007 9:10 am) Since I always drive the same route the only major changes happen when the colder (not really very cold) season starts in November or when it starts to warm up in March. Here in Vancouver, BC, the lowest temperatures we get are around 20 degrees F and don't stay for long periods of time. By the way, I own a 2007 Sentra that is in for service today and the loaner I got is a 2007 Impala. What a nice car! If I believe the computer I am getting 32 MPG on my commute and that would be awesome!
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Replying to: pulgo (Nov 28, 2007 12:27 pm) 32 mpg in a V-6 Impala is very feasible...especially with the 3.5L engine.
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| Seems the 3.5 V6 is nearly as fuel efficient as the new Malibu in real world numbers. | |
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| Does anyone know a practical / economical way to change out the 3.29:1 axle ratio on the LTZ (3.9L engine) for the 2.86 ratio from the 3.5L engine? | |
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Replying to: quietpro (Nov 28, 2007 1:26 pm) |
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My 3.4L 2002 impala has about 110,000 miles. I just got 33.5 mph on the "highway." That included driving through a few small towns with stop and go traffic. Most of it was 55 - 65 mph. City driving is about 25 - 27 I try to "hyperdrive" by anticipating stop lights and stop signs. No jack rabbit starts. Lots of coasting when possible.
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Replying to: superdow (May 06, 2008 4:43 pm)
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