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Old 11-02-2019, 09:23 AM   #17 (permalink)
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Originally Posted by Galvatron1 View Post
Just went from 40 psi to 50 PSI today & still can't avg 40 MPG on the highway at 50-65 MPH at night. It was 43 F @ 9:30pm

Does temperature really decrease mpg that much? I was getting over 40 MPG on the highway just a month ago, at 35 PSI!! The temperature was 30-40 F higher & it was day time.

I won't block the grill holes, b/c closely monitoring the engine for overheating isn't something I want to worry about.

I'll either have to deal with it, or find some other simple things to boost mpg.

That brief 1 minute 60 mpg spike, was me coasting off the highway exit to local roads. The data certainly is interesting.

Briefly around noon, it was only a high of 53 F, but I was able to avg 40 mpg on the highway @ 50 psi, thanks to the car heating effect of the sun at high noon. I even had 3 consecutive minute peaks at 60 mpg & a few other good minutes with fuel economy above 54 mpg around noon.

Before I changed my engine, I could get 100+ mpg average (over 100+ miles) cruising at 50mph on a warm day, and had a best tank in the high 80's. During the dead of winter I struggled to get low to mid 50's, but it can to zero or below here. So yes, temperature can have a huge impact, as can stop and go travel.

I run a 75% grille block through summer. Once it's below freezing outside I block it 100%. When I first blocked it I kept an eye on things until I was confident it wasn't going to overheat.

In most vehicles, when you let off the pedal, the vehicle goes into what is called "DFCO" or deceleration fuel cut-off, where it burns zero fuel and your fuel economy is infinite miles per gallon - for example, 1 mile of coasting with zero gallons used is 1 mile divided by 0 gallons. Chances are good the Toyota display doesn't show this and just gives what is a large number for the car.

I had a rental Corolla a while back, I believe it was a 2015 with a CVT, and according to the computer I was able to get mid-50's MPG cruising at ~55mph once the car was warmed up, even with it being in the 40's outside.
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