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#1
07-13-2006, 05:37 PM
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11.6 average mpg- average speed 12.0
The other day after mostly city driving and no roads above 45, approximately driving a little over 100 miles over the course of several days, the onboard computer states I was averaging 11.6 mpg and the average speed was 12 even. Is this common for the 3.8 impala?
I have other posts listed in the impala forum regarding gas mileage. Considering all plugs\wires\filters were replaced under 1000 miles ago at most, I am starting to think there may be a problem. Any ideas are appreciated- Tim 
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#2
07-14-2006, 04:42 AM
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Re: 11.6 average mpg- average speed 12.0
my god.... do you jam the pedal down and make sudden stops instead of gradual ones? if you're doing that ur mileage will be lower per gallon
__________________
1999 Chevrolet Monte Carlo LS [semi-daily driver until LIM repair or trade-in for '13 Fusion, 110k miles] Gone but not forgotten: 1995 Pontiac Grand Prix GTP[sold, 128k miles] 1996 Oldsmobile Cutlass Supreme SL Coupe [a minivan tore my door off, totaled, 84k miles] 1998 BMW M3 Hardtop Convertible [a pathfinder armada stopped in front of me, totaled, 70k miles] 1989 Chevrolet Cavalier Coupe [died, 160k miles, engine problems] 1990 Hyundai Excel GL [died, 220k miles, died]
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#3
07-14-2006, 10:44 AM
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Re: 11.6 average mpg- average speed 12.0
With average speed of 12 I would guess you did a lot of stopping. The hardest part of gas mileage is getting the car weight moving. A 3.8 should be getting 22-24 average around town with most roads at 35-45 mph and not too many red lights. If you are in a down town area where there is a light on every block, 11.6 might not be out of line. However I might still check if any of the fuel injectors are clogged. My daughter's 3.8 clogged when she didn't use quality gas. Since using Shell and Chevron she hasn't had any problems. But before she used whatever was cheapest.
__________________
66 Charger (the ORIGINAL!!) (auto, 2 dr, 7.2L) 67 Chrysler Newport (auto, 2 dr, 6.3L) 98 Mazda Millinia (auto, 4 door, 2.5L) 04 Cavalier (auto, 4 door, 2.2L) *seems like my engines keep getting smaller
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#4
07-14-2006, 10:49 AM
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Re: 11.6 average mpg- average speed 12.0
I'd also do a MANUAL calculation of your mileage. The on board computer can be inaccurate in several situations.
Take a mileage reading while car does not have a full tank. Fill car full. Drive. When you get gas again - fill it again, take mileage reading and how many gallons you got. Subtract second mileage from first to see how many miles you went. Divide those miles by the number of gallons you purchased with the second fill up for the actual mileage.
__________________
66 Charger (the ORIGINAL!!) (auto, 2 dr, 7.2L) 67 Chrysler Newport (auto, 2 dr, 6.3L) 98 Mazda Millinia (auto, 4 door, 2.5L) 04 Cavalier (auto, 4 door, 2.2L) *seems like my engines keep getting smaller
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