CPU updates @ 5,000 miles & 10,000 miles - Mileage chngd

Ken Cooper · 09-04-2004, 12:00 AM

During my 5,000 mile service visit the dealer did a CPU update. Following that. my mileage dropped from 49 mpg average to 47 mpg average.

During my 10,000 mile service visit the dealer did another CPU update. Following that, my mileage increased from 47 mpg to 50 mpg.

I can't see any factor other than the CPU update that might have affected mileage. In both cases, I checked the tire pressure following each visit. In both cases the tire pressure was factory spec.

Anyone else experience this?

hdrygas · 09-04-2004, 12:09 AM

I would love to see the algorithms used to calculate "Tank average M.P.G.

Bob Allen · 09-09-2004, 01:19 PM

Quote:

I would love to see the algorithms used to calculate "Tank average M.P.G.

I would too. I would also like to be smart enough to read them.

09-04-2004, 12:00 AM	#1
Ken Cooper Senior Member Join Date: Mar 2004 Posts: 339 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	CPU updates @ 5,000 miles & 10,000 miles - Mileage chngd During my 5,000 mile service visit the dealer did a CPU update. Following that. my mileage dropped from 49 mpg average to 47 mpg average. During my 10,000 mile service visit the dealer did another CPU update. Following that, my mileage increased from 47 mpg to 50 mpg. I can't see any factor other than the CPU update that might have affected mileage. In both cases, I checked the tire pressure following each visit. In both cases the tire pressure was factory spec. Anyone else experience this?

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09-04-2004, 12:09 AM	#2
hdrygas Senior Member Join Date: May 2004 Location: Olympia Wa Posts: 3,650 My Car: 2004 Prius Model: Package: #9 Thanks: 0 Thanked 2 Times in 2 Posts Friends: 0	I would love to see the algorithms used to calculate "Tank average M.P.G.