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Chevrolet Impala Real World MPG
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Comments
This could be due to 2 main factors 1) This is a new car with less than 1500 miles on it presently 2) I am driving in the winter vrs the summer. I'll be taking on a 1200 mile trip this weekend to check the highway mpg.
I would like to hear from drivers with the 2009 to compare and see what mpg they are getting. I miss my 24 (although it was in the summer).
I know cars get worse mileage in the winter for a variety of reasons, but does the car get better meileage as it gets older and more broken in? :confuse:
The engine should have varying speeds, so the engine parts can heat up and break in under normal hwy speed and then cool at slower at slower hwy. This should be done with the time intervals 15 min normal and 15 min at slower speed. It will greatly help the fuel mileage and overall performance of the life of the engine.
My father just purchased a SS impala , it went on a 3000 km trip and the fuel mileage was 24-27 mpg. They just went on a 500 km trip on flat land and the mileage went up to 32 mpg. This improvement is probable due to the previous trip through the mountain ,varying the speeds and allowing the V-8 engine to break in.
Still the fuel mileage hasn't reach the rated 37 mpg but it only has 4000 km and is being driven in winter. Even with the fuel management system that works very well GM's mpg for the v-8 is hard to reach.
I can average above the EPA estimate at 65 mph with my SS (5.3L V-8).
BTW, the wheel size shouldn't have a great effect in highway mileage. The biggest impact of wheel size would be in city mileage where the added weight would effect fuel consumption. The effect while cruising would be minimized.
I've found this to be true on a 2009 Impala LS. It says I got 25.3 mpg, but upon checking (miles vrs gas used) it comes out to 22.9. That too me is a huge difference. This is the second fill up in a row I have tested it and they both came back the same - way off.
I have tracked my mileage since I bought my car over three years ago. I am always within a 1 or 2 mpg from the indicated amount...but less than 1 mpg difference 95% of the time. The computer in my car is extremely accurate and given the variances that I am forced to deal with, it may be more accurate than I am capable of being.
I have found when filling up that regardless of what gas station I use, the pump shuts off about 2 gallons early. Meaning, I can usually put 2 more gallons in after the pump first shuts off.
The reason is that although they might survive much longer periods working as intended, they are notoriously difficult to remove after many years.
Even when installed properly with a bit of anti seize compound they are a pain to remove without causing damage.
I always get new plugs at around $ 2 per plug (platinum) so the investment is really not much.
Lastly, your car is paid for and anything requiring fixing is going to be much cheaper than 3 to 5 years of monthly payments, especially in these tough times.
At 255k, have you had to replace your upper intake manifold yet?
I was really disappointed in the mileage but the car is great and I love everything about it except the mileage.
This is on a 2007 with the 3.9 with new 235/50/18 tires in place of the factory 16's.