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post #1 of 2 (permalink) Old 07-27-2011, 01:28 AM Thread Starter
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Default Lost fuel mileage

I have a 2006 prius,after having a 30000 mile service,my mileage dropped from 43 mpg to 38 mpg.I called Toyota Certified to complain,they tested it & said everything checked out ok.I drove for 1000 miles with no change in mileage.I called again,they suggested I raise the tire pressure to 40 psi.I did that& my mileage improved to 39 mpg.I called 2 other Toyota Dealerships & they said there is nothing that can be done.I live in San Diego where the weather doesn't change much,I am the only one driveing the car,I make the same trips weekly.I'm 72 . What can I do?
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post #2 of 2 (permalink) Old 08-13-2011, 03:03 PM
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Default Re: Lost fuel mileage

Others have suggested that disconnecting the battery for a few minutes and then reconnecting it will allow the hybrid module to "relearn" your driving style. This might be worth a try. Also, we have found that the dealer lowered our tires to the pressures on the label inside the door jamb, which lowered our mileage; because we run our tires at higher pressures. Otherwise, here are a couple of other driving tips that may help:

* If your tires are rated at 44 psi (check the "maximum pressure" on the sidewalls), pump the fronts up to 44 and the rears to 42. That increased our mileage by 2-4 mpg.

* Try this driving technique (in town). At traffic lights, accelerate briskly up to 30-35 mph, then click on the cruise control. After that, use the cruise exclusively to accelerate and decelerate. This allows the computer to control the electric motor and ICE to maximize fuel economy. Anticipate light changes from at least a half-mile away, if possible, and begin clicking down on the cruise until you just roll to a stop at the light. If you click down at around one click per second, it will maximize the time you are running in electric mode, and the ICE will not run, which saves fuel. If you drive the same route everyday, try to find the speed at which the lights are synchronized. If you can roll through each intersection without stopping, that will save a lot of gas. Using this technique increases our mileage from 44-46 mpg to 51.5-53 mpg, in town.
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