2007 Yukon Poor Mileage

10 messages, Last post on Oct 04, 2007 at 7:34 PM

You are in the GMC Yukon Forum. Your Hosts are steve_ & tidester

#9 of 10 Re: Holding true so far [zwitter153] by tidester HOST Oct 01, 2007 (9:21 am)
Replying to: zwitter153 (Oct 01, 2007 4:13 am) That's pretty amazing! Most tests that I have read^* about show very little difference in gas mileage between running with air conditioning and running without it. However, the "off" condition was done with the windows open which, of course, increases air drag on the vehicle. If you're running with air conditioning off and windows up then I could see some difference in gas mileage. Very interesting! (^*) See e.g. Test #4 in our Fuel Economy article. tidester, host SUVs and Smart Shopper
#10 of 10 I am a little O/C about checking my milage by dardson1 Oct 04, 2007 (7:34 pm)
Everyone assumes fuel is a constant. Since ethanol, with many fewer btu's per gallon is the new additive (for whatever reason they need an additive), it makes a huge difference how much ethanol is in the blend. A full dose of ethanol in the blend can lower milage substancially. Unless you know what's in your fuel it's pretty darn hard to know the real milage. Since fuel blends have moved from MTBE's (think that the name) to ethanol I've given up trying to keep up. My milage used to be fairly constant but these days it bounces around like crazy. It's the dang gasoline.