Originally Posted By: M1Accord
The Fit needs an Eco mode like the Civic. There are times I am doing 50 mpg cruising on a nice highway and bam, I am getting 20 mpg instant fuel economy because there is a hill or I need to go a little faster. The worse part is when there is a downhill and I want to coast down and take the momentum to go up without using much fuel. It would only work if I keep a super light pressure on the gas pedal to keep the car in 5th gear, otherwise it would shift down to 4th or even 3rd, depending on previous speed, to engine the car. WTH Honda. This is not a Audi TT or even a Miata. It is a a subcompact commuter car that looks sporty.
I don’t think you understand how this works. When the car is going up a hill it is doing considerably more work than when on flat ground. Hence the engine burns far more fuel. However, on the decline, it is doing far less work—you should see the mpg go all 9’s or at least very high. Average out both sides of the hill, and it is likely to be close to what you see on flat ground.
Or, are you complaining because the transmission is downshifting while going down a hill, for additional engine braking, so as to control speed? I think my recent drive in a Toyota was doing that, may have unlocked the convertor during engine overrun or something similar (engine speed seemed to drop when I would let it coast on the highway, then jump up when got on it, then it’d bump down to a steady level). If so, have you tried using the cruise control? I recall reading that some vehicles are better at holding a gear with cruise engaged: the thinking is, the ECU, in an attempt to make the vehicle “sporty” will downshift aggressively, getting the car into the powerband “just in case”; while with cruise on it may recognize that fuel economy is more desired.
You could try gently accelerating up, prior to the hill; and then letting it scrub off speed as you climb it. That might help it stay in top gear, and locked up. In the end though I think this is just normal operation for a high-rpm engine that is being asked to lug for fuel economy—any time it needs to do real work, it’s going to double-downshift.