Thread: MPG??? B chassis

Great post, this is exactly what my research has been finding too.



Nooooo, you had such an awesome post. Oh well I guess old habbits die hard. On modern manual cars, aka most fuel injected cars, when you are decelerating he ECU cuts the fuel off completely. Reason is, the wheels spin the transmission, which spins the flywheel, which spins the crank, which keeps the pistons moving, which keeps the engine running, even though there is no fuel going in.

Now Automatics didn't have this feature for a while, since it's harder to force the auto trans to stay in gear instead of downshifting. But from what I was told, modern day auto's should have the fuel cut on decel too.



Careful with the mirrors, check local laws first. I usually have my tires at 35-38psi, haven't seen any significant differences.



Not here to change anyone's opinion, just trying to educate with facts .

I generally see 26-29 MPG on my car. 204,000 miles, original USDM low port in my 1995 200SX SE-R.

I am happy with it. Your numbers see low.

i was getting 27-30mpg before i broke it. Hoestly i think a flywheel helps and coasting in neutral when going down hill.

Interesting. I've heard this stated elsewhere too, although I've heard it debated both ways. I'll have to try this on my next tank. A big reason I use nuetral is to save wearand tear on the tranny. I'd rather do brakes more frequently than a tranny. Yes I know these trannies were meant to downshift, but I do it anyways. Another thing that I do is blip the throttle on downshifts to make good transitions. This is obviously not ideal for max mpg. So I feel my driving style wouldn't make for better mpg. Who knows until I try it. Thanks

Another thing to point out is letting off on the gas while in gear slows down the car more than coasting in nuetral (duh). This is great for coming to a stop, but not on a continous drive (i.e. downhills followed by uphills/level roads) because you'd have to give it more throttle to get it back up to speed after coasting.

If you have a Wideband, it will go extremely lean or show ---, that's when you know your engine is working for free . My scan gauge also reads a very high MPG figure at that point too.



The thing is, you waste energy when you brake. Momentum turns into heat. So to be a complete hypermiler baller, you have to never use the brakes .

But yes, brake pads are cheaper then the transmission. Rev matching helps a ton to save the life of both the trans and the clutch.




It does indeed. Since 99% of my daily driving is city, I use this to my advantage when creeping down to a stop light . But I also am a religious cruise control user. So coasting in neutral is almost out of my diet .

When you cruise downhill in gear your ecu recognizes that as the decel point and basicly almost shuts off fuel completely. You will actually use more fuel coasting downhill in neautral than keeping it in gear and off the throttle completely. This has been a proven fact.

I didn't read the whole thread, I skipped around

My b14 with a ve swap, gets 29-35 mpg all highway, tuned for 87 octane (premium gets same mpg), pathfinder maf, vvl @5000 rpm, k&n w/pop charger, cat back exhaust, no emissions except for cat, I use castrol syntec 10w- 30

I drive 58 miles each way to work 7 days a week, and 62 miles each way to school 2-3 days a week, gas is costing me about $200+ a week, I change my oil at about 4000 miles which is about every 3-4 weeks

I get about 20 mpg with about 70% of it highway miles lol if I drive all city I get about 19mpg.
My car just rolled to the 130k mark and I usually shift at about 2k if i'm driving slow or 4k if i'm driving normal

low 20's in city 23 highway, Never ever over 25mpg even at 99% highway from Wi to NV
(110k auto 1995 200sx SER)

01 p11 190k all stock

325-350 per tank city/highway

425 per tank all highway