Quote:
Originally Posted by aerohead
If you're targeting 40-mpg,City,aero mods aren't going to return much of a benefit.You're basically battling momentum losses and transient loads.There's very little to do in the way of weight reduction.A 10% reduction in rolling resistance nets less than 2% in savings.You already have 'start-stop'.That was good for 7% mpg.GM has long electrified many engine accessories.'don't know what you'd do under the hood.
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my local speed limits are highway limits basically 45 to 60mph I want to keep it in CVT mode also known as
EVT2 mode 6th gear.. 1000-1050 rpm = 38-45mph. 47mph it shifts into 4th gear (it's a 4 speed automatic with CVT )
the instant reading in CVT at 38 to 46mph is 40-45mpg If i'm able to keep it from leaving CVT mode if the engine load goes above a certain amount it will shift into 3th gear (4th gear is at 47mph) optimal speed is 59mph in that gear
a light breeze will increase the engine load and kick it out of EVT2..
Aero mods are needed to keep the engine load lower @the optimal speed which is 40-44mph
that is how I was able to get 31.1MPG locally I got lucky and had a slight tail wind and on my way back..
another issue is electrical load that could restart the engine at a stop light from Auto Stop
the under body is a mess as well as the rear of the SUV it has a large wake that sucks up air from under the SUV (heavy turbulence = lost energy)