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Sedans Chevrolet Impala Chevrolet Impala Real World MPG
117 messages, Last post on Apr 15, 2009 at 11:28 AM
You are in the Chevrolet Impala Forum. Your Hosts are pat & karens
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Replying to: joeboston (Aug 13, 2007 9:19 am) Just fill up, reset the trip meter to zero. Next time, do the same again and divide the gallons printed on your receipt by the miles shown on the trip meter. Reset trip meter. Repeat this procedure for at least 3 tankfuls and you will have a fairly accurate MPG figure.
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Replying to: pulgo (Aug 13, 2007 9:37 am) |
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City driving in Atlanta: I consistently got 23.9-24.1 MPG during winter. During summer with a/c consistently get 23.2-23.3 MPG. Better on hwy, add 2.0 MPG to winter and summer city average. This is very good to me. What do you get? |
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Replying to: KarenS (Jun 02, 2005 11:20 am) 14.5 MPG city driving. Might as well be driving a truck.
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Replying to: steve333 (Oct 27, 2007 7:25 pm)  Seriously, though, you must have some serious issues unless maybe you're using the trip computer and have never reset it for a fresh reading. Another poster was having terrible averages and I believe it turned out that she had never reset her trip computer. Is that a possibility?
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Replying to: quietpro (Oct 28, 2007 2:19 pm) Tell me steve, what kind of mileage did you get in previous vehicles in the same conditions/average speed? |
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We rented a 2007 (or 2008, I actually didn't notice) 3.5l Impala for a long weekend trip to Kansas City recently. I put over 1,000 miles on the car, and had the compressor running pretty much the entire time (AC on the drive up, and defroster running all the way back), and averaged 29 MPG. The DIC showed closer to 31 MPG, but when I got back and tallied up the receipts, it came out just over 29. Still not bad considering there were four of us plus luggage in the car most of the time, and I was driving 70+ MPH for the bulk of the trip. My only complaint about the car was the lack of a center armrest (and more importantly, cup holders) for the rear seat passengers; otherwise it was a great Interstate cruiser. |
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I read a lot of differences in mileage reports. There are a few key factors and a few medium factors in mileage. Key ones are how much braking, how much accelerating, and how much % of time just cruising in high gear. Medium factors are correct tire pressure, clean air filter and how fast acceleration is. Other factors are if you are a drafter or a draftee, wheel alignment, tire type, engine tune, flatness of terrain and how fast you go on the interstate. Aerodynamic Drag is a function of velocity squared. At 70 mph, relative drag effect is 4900. At 80 mph, drag effect is 6400. 14% more speed created 31% more drag force on vehicle. Luckily, mileage doesn't drop 31% when you speed up to 80 mph due to high powered engines and well designed transmissions in cars. Even wind can effect mileage. If I drive into the wind both ways on my 47 mile commute, it will reduce my mileage. I Think The best way to compare mileage is to take a 200 mile trip at no more than 75 mph and report that number only. Any city number or number for a short stop and go commute is greatly affected by the factors listed. I drive my son to college in his V6 Mustang too often and it's an 85 mile trip of which only 30 miles is on an interstate. I counted the lights and discovered there were 60 of them. Thats a stop at an average of every 1.4 miles. The car gets 29 mpg on these trips. I thought it was highway driving until I counted all the lights. It gets 29-30 driving the 47 mile commute to work. Even With heavy stop and go rush hour traffic averaged in, it gets 27-28. The stop and go driving is 20% of the trip distance but adds 20 minutes to the time to get there or back. I do not know the true trip mileage for the car, but don't expect more than 31. I see a special price on an '08 Impala locally and the opportunity won't come around again. The LS model with a 3.5 liter V6 seems to be capable of low 30's on a trip according to some posters here. My work commute usually gets me 28 mpg for my 3800 Buick and 29 mpg for the 3.8 L Mustang. Based on this I think the Impala could get 29-30 commuting. The Impala is a lighter, smaller, lesser powered, smaller engined car than my Buick. When I looked into a Cobalt, I was expecting about 32-33 for my commute but didn't get one. This Impala opportunity is at a better price than the Cobalt price was at the time. Can anyone say that the Impala 3.5 is not capable of better mileage for me than my pair of 3.8 liter cars (28 and 29)?
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Replying to: dave8697 (Nov 06, 2007 6:10 pm) If my commute involved a lot of highway miles, I wouldn't hesitate to buy a 3.5l Impala. On the worst of days it'll equal the best mileage you're getting with the 3.8l cars, and on it's best days it'll do much better. |
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