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maybe not hot like Phoenix, but very hot for me, no A/C windows down at 2pm and windows down at midnight. actually quite nice at midnight with the turbulent air . 85.7 mpg over 44 mile, with a 74.5 mpg over 558 miles

03 slvr mt
brft drvr
 

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It was a bit too hot (relatively speaking) here yesterday, I was out in the early afternoon for some crazy reason and even with the AC blowing I still averaged in the mid 60's. And that was after being stopped in traffic for over 5 minutes (engine running) after just getting in my car and if I turned off the AC it was like a furnace inside. On the way back home I turned off the AC since it was cooling down and was getting 75-100+ MPG for much of the ride.

I wasn't going for mileage on this trip but I should have tried. I did notice last time we had some heat I got great mileage though.
 

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Yeaterday I gassed up for the first time since May 20, 1021.8 miles. 12.3 gals. The car said 87.6 MPG My calculator said 83.07MPG. That is a 5% diff. I don't trust a calculators results after a one tank average because there are too many variables, such as gas filler length, pressure, temprature, etc. Driving home from the station the temp was 110, no A/C, window down 4 inches, driving very careful the current MPG seamed "stuck" on 150. It stayed that way untill I got into stop and go traffic. When I got home it was down to 130.8 MPG after 16.8 miles. That didn't sound right so I checked the accuracy of my trip A 14194 miles and Trip B 38206 miles. Trip A car = 78.4, calculator =75.96. 3% diff. Trip B car =76.8, calculator =74.095. 3.5% diff.
I get better milage in the heat too. Maybe it's the summer gas and or better atomization.
I don't know how accurate 130.8 is but it's fun to brag about.
Louis
 

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Opposite experience here, I was in Boston (the heat, my God the heat!) and got to enjoy the simultaneous drag on the engine of A/C (ECON on) and a recal. I had to change my shifting pattern drastically as I couldn't count on low RPM boost from the IMA anymore and my return trip MPG was in the low 60's (going in it was in the high 80's).

That "stuck" 150 mpg sounds bogus to me, others have reported problems with the MPG readout "sticking" in that manner. An obvious check would be to switch to metric. If you are burning gas yet reading 0 L/100 km consumption you know that the readout is simply messed up. Sounds like you got it working again though.
 

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An easy way to check if it actually is stuck is simply push on the gas, if the insantaneous milage goes down, it's not stuck.
I have had it really stick at 150 twice before. Nothing I did would move the instantaneous bar. I finally turned the ignition off and back on and that fixed the stuck bar.
Louis
 

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It's not stuck...
After filling the tank, the MPG reader has to readjust itself, and always reads unusually high MPG readings... It will adjust itself after a little while, or the next time you park for a bit then get back in and drive.
 

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Louis, since you last purchased gas they got rid of the 10% ethanol in our gas for summer. You'll have more BTU per gallon this tank.
 

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The winter gas season is from October through March. When I gased up on April 20, I was hoping that all the winter gas was gone. I got my personal best one tank mileage of 91.1 on that fillup. I think you can count on about a 5% loss on winter gas.
 
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finished off a tank of gas with the get gas indicator and no bars lit on the fuel gauge. 730.7 miles with 76.3 mpg. filled the tank with 9.835 gallons at 1.959 dollars per gal. Last tankful on 6,10,03 with 9.187 gallons placed after 659.6 miles at 73.7 mpg, Our Chevron bill has gone from about 200 dollars to most recent 49 dollars.

03 slvr mt no a/c drvn brft
 
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