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About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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2011 Jeep Patriot Lousy Gas Mileage

I bought my 2011 Patriot on December 20, 2010, in large part because of the advertised gas mileage. The window sticker for my 2.4L, CVTII, 4WD is 21 mpg city and 26 mpg highway. Thus far, while driving in very light city conditions and then on a highway trip to Pittsburgh (from Erie, PA), I have been getting 17-18 mpg and 21-22 mpg, respectively. That is far below the advertised mileage, and that's with only a couple miles of 4WD driving time, and I do not let the vehicle sit idling at ATMs nor do I let it idle a long to warm up (kept in a partially heated garage). On my last vehicle (2007 Cobalt) I routinely beat the sticker mpg by 5-7 mpg, so my driving habits are not at fault.

When I called the dealer's service department (Gary Miller Chrysler-Jeep. Erie, PA), I was told it's because of winter fuel mixture, the engine not being broken in yet, and even that the fan motor from the heater are the cause. The guy was serious about the fan motor on the heater. The EPA is very stringent about the conditions under which mileage ratings are published, so I don't buy the line. Modern engines are built to very close tolerances and require almost no break-in period. The winter fuel blend might be responsible for a little of the bad mileage, but this is 20% below advertised. It's at the very bottom of the range that factors in worst-case conditions like full load of passengers and cargo, hilly terrain, windows down, etc. My conditions are about as close to ideal as possible.

With gas heading for $4 per gallon, this is very distressing. I specifically chose the Patriot over the Ford Escape because of the gas mileage. My 4-cylinder Patriot is getting the gas mileage of the 6-cylinder Escape - totally unacceptable. BTW, mileage calculations are via the Vehicle Information Center (VIC) computer that I ordered with it, so the values are not subject to filling at the same gas pump each time, tracking miles accurately, etc; the VIC calculates the values real-time, and I monitor them closely.

For the first-ever Chrysler product in my 52 years, I'm not impressed.

These original Kirt's Cogitations™ may be reproduced (no more than 5, please) provided proper credit is given to me, Kirt Blattenberger.

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   Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted thought or reflection; meditation; contemplation.
   Kirt [kert] – proper noun: RF Cafe webmaster.

These items are an archive of past Topical Smorgasbord items that have appeared on the RF Cafe homepage. In keeping with the "cafe" genre, these tidbits of information are truly a smorgasbord of topics. They all pertain to topics that are related to the general engineering and science theme of RF Cafe. Note: There is also a huge collection of my 'Factoids' (aka 'Kirt's Cogitations') that might interest you as well.

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