Larry, Think of it this way: If your indicated speed is 83 but your actual speed is 70, that means your true distance traveled is 70 83rds of the indicated speed. Expressed as a fraction this would look like: 70 —- 83 If we convert the fraction to a decimal factor (by dividing 70 by 83) we come up with .8433. With this in mind you can either multiply your distance travelled .8433 and then figure your mileage (772 miles * .8433 = 651 miles divided my 62.6 gallons = ~10.4 mpg) OR take your 12.25 mpg and mulitply it by .8433 for an answer of 10.33 mpg. At that rate if fuel consumption, we won't quibble about the .07 mpg now will we?! Me thinks you need a tuneup.... <grin> Best Regards, TFM Thomas F. Miller tfm@xxxxxxxxxxxx '57 300C >>> "Tony Bevacqua" <tonysru2@xxxxxxxxxxx> 1/26/2009 7:53 PM >>> Why don't you Google or Map Quest, etc. the miles and divide the used gasoline to find the answer??? :) -----Original Message----- From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of JettLarry@xxxxxxx Sent: Monday, January 26, 2009 4:49 PM To: chrysler300@xxxxxxxxxxxxxxx Subject: [Chrysler300] Gas Math Back from trip to Temecula to hob nob with fellow 300'rs. Trying to get a handle on the MPG. In 772 miles I used 62.6 gallons of hi-test. Easy enough here. Divide 772 by 63 showing 12.25 mpg gross. BUT, speedo is widely optimistic. The GPS says when the odo shows 83, actual road velocity is 70. This appears to be 18 percent high. Do I multiply the 12.25 by 118 which gives 14.45? Or perhaps reduce the 772 miles which would also be 118 % high to the actual road miles driven? Maybe that is the same but cocktail hour is drawing near and don't want to damage the few brain cells left, that is Jack Daniel's job. Help. I was always asleep during math.....only woke up for lunch and auto shop. LJ **************Know Your Numbers: Get tips and tools to help you improve your credit score. (http://www.walletpop.com/credit/credit-reports?ncid=emlcntuswall00000002) [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/Yahoo! Groups Links ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: mailto:Chrysler300-digest@xxxxxxxxxxxxxxx mailto:Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/