what is your optimum mileage speed??
 

I have a 94 nissan sentra, no scanguage, and I am trying to get an educated guess at what my best speed would be with 1.6 manual 5 speed. Any help??

The slowest you can go in 5th gear.

I drive 30 in fifth at about 1k rpms at around 70 mpg.

Mine is 55 mph for a steady 45 mpg. Lugging the r18 around isnt good.

It's funny because my engine doesn't rly do the whole lugging thing like my mom's does, *shrug*

EDIT: Just goes to show how good psyshack is at driving...

The lugging isnt se the typical lugging. My refrence to it is in the valve timing and such. That graph honda put out IMO is misleading. To say your 1.5L valve timing at up to 3500 rpm isnt true IMO. Watching a ScanGauge will show you if your at say 2000 rpm putting along or even slower at 1500 rpm. Any change in road surface a oz. more on the throttle any number of varibles. And the mpg goes down thru the celler and the lod% goes way up. This is telling me that a load has been seen for whatever reason and I think its then going to the normal 1.8L setting.

So Ive been more inclinded to leave the car in 4th gear and let the rpm's climb a bit. and watch the lod% stay more stable. There by letting the car pull a slight change in grade easier.

I bet theres something going on in the ECU thats not real clear. I know Im baffled by it all. It would seem throttle position, air/fuel mixture, and forward speed all play into acct. on this. Then couple some of the utterly strange MAP readings, I have to wonder just whats going on here.

I wish there where more r18 drivers out there to help with unlocking this engines secrets. I do think Honda has managed to build a FE engine for dummys. The worst MPG Ive gotten with it was 29 mpg. I was rat racing it, smoking the tires, 0 to 60 runs, driving around town with the windows down, sunroof open and the A/C on, every FE ruining move that could be made. Even our trip the PHX netted a ave. 38 or 39 mpg. (Tanks in the log) and that was with horid head winds on the way out. Cruse Control on and alot of A/C use with almost no hypermiling. That Impressed me to no end.

So to really push FE is a chore.

Don't you have a MAF? I'd say the MAF is much more mysterious than a MAP. I really need to get datalogging going on my ecu, :p

MAP, Mainfold Absolute Air Pressure readings from the ScanGauge.

That's true, why did I think they were exclusive. I was thinking MAF vs IAT. Stupid ****er that I am.

the littlest amount of throttle you can give while in 5th gear will give you the best results. Try feathering it if you have trouble keeping it at light.

In the 1994 Suzuki Sidekick I've been using, I can get ~30 mpg if I go 50-55 mph on the highway in 5th gear, and around town go 25-30 mph in 5th gear with stop and go traffic.

But if you drive it normally, go 70-75 mph on the highway, use moderate acceleration, it gets like 16 mpg, well under the EPA rating.