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04-17-2013, 01:02 AM #1
Finally off winter blend gas here in St. Louis. Much better MPG.
I think we are finally off winter blend gas here in St. Louis. My mileage went up decently with this new tank of 87. After ~40 miles of highway driving having the cruise set at 63 I was getting 21.8 MPG. No I did not reset the average MPG while driving down a hill.
Remember to always use cruise when you can.
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04-17-2013, 01:09 AM #2
Just in time for my trip to Oklahoma. I get 19-20 mpg with summer blend and 16-17 with winter blend. Pretty substantial difference.93 Suburban (Southern Slayer): TBI 350, 4L60E
73 Z28 Camaro: L82, TKO 600
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04-17-2013, 08:11 AM #3
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- Dec 2011
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In CT winter blend is actually more efficient then our summer. Right now were on just plain gas with no state required additives which we only have in spring and fall before the two other blends. The summer gas has an anti smog additive that ends up hurting MPG more than planed.
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04-17-2013, 08:29 AM #4
Amen to that, glad to have it back, definitely welcome the added mpg. The only bad thing is nicer weather means I want to drive more and the windows are down. lol Cruise control is the best way to go on interstate and flat terrain so I agree there but on rolling terrain cruise control can hurt more than help from my experience.2002 Chevy Silverado & 1995 Ford Bronco
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04-17-2013, 01:13 PM #5
One of the car magazines, possibly car & driver, did a test about 15-17 years ago to determine if a conscientious person could achieve better mileage than cruise control. They used about 10 drivers and 10 diff vehicles. The tests with the drivers controlling the throttle did get a bit better mileage, by about .5 mpg, if i recall. The cruise control vehicels that did the worst were large V8 cars and trucks, where the cruise would downshift going up a hill, speed up, then hang at the CC-set speed without shifing into the next gear. One of the test vehicles was a new Vette, and everyone complained that when the CC downshifted, the thing took off like a rocket...pretty funny.
04-17-2013, 02:42 PM #6
I would like to see a test re-done with today's modern automobiles.
Now, another point, who here is that conscientious on say an 8 hour drive? When on the interstate, I prefer to set the cruise and forget about it.
Edmunds did a test and found up to a 14% fuel savings by using cruise control. If you have it, use it.
04-17-2013, 05:38 PM #7
04-18-2013, 01:23 AM #8
15-17 years ago would be 96-98 so we were already into OBDII and (to my knowledge) no carbureted engines made it to OBDII (I think 87 or 88 was the last year for carburetors in GM vehicles) and most everything was already some form of sequential fuel injection. I generally do use cruise (unless I'm in the Camaro which does not have cruise) unless I'm in rough terrain or in city traffic. The biggest advantage to cruise for me though is avoiding speeding tickets. It would be real easy to get going too fast on I-40 between Memphis and Little Rock when I'm on my way too or from Oklahoma because of how flat and open it is.
04-18-2013, 02:35 PM #9
04-18-2013, 04:21 PM #10
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- Mar 2012
Gm PCM's use a fuel saver mode when cruise is engaged so driving on level road with both scenarios the vehicle will get better fuel economy on cruise. Driving in hilly country cruise will use a bit more fuel.
I use the manual mode to down shift to 5th BEFORE the hills and get great fuel economy
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