High revs?

[Sspring89]

Driving on the highway the other day i noticed that my tachometers revs were really high. i was going 65 and my revs were already 3k. When i went to 70 they were 3.4k then when i was at 80 it was 4k. this seems a very high for highway miles and it eats up my gas. Also i have no mods under the hood as of yet so i can eliminate that theory. does this happen to anyone else's msp? or do i have a tranny problem? thank for any input.

[Andrewsmc]

i think you wre daydreaming

[Andrewsmc]

imo

[RenzoMSP]

Well i was doing an average of 70mph on one of my road trips and was doing 32mpg. If you want better gas mileage drive slower.

[magnumP5]

Driving on the highway the other day i noticed that my tachometers revs were really high. i was going 65 and my revs were already 3k. When i went to 70 they were 3.4k then when i was at 80 it was 4k. this seems a very high for highway miles and it eats up my gas. Also i have no mods under the hood as of yet so i can eliminate that theory. does this happen to anyone else's msp? or do i have a tranny problem? thank for any input.
Sounds normal to me. Even though I don't have an MSP it's the same transmission - we're just geared lower - it's what makes these cars so much fun to drive sometimes. But yeah, highway driving it kind of annoying, but it doesn't seem to affect gas mileage too much.

[MSpeed2397]

I always get decent mileage, something around 28-30mpg overall city/highway. Then again I haven't driven my (*#@%^ car in months...so that may not be entirely accurate.

[Jackelope]

I get 28-30, well.. right now 25-26 (O2 sensor bad is what I blame it on, not my right foot...)
Last road trip, i got ~ 33mpg @ 70mph on I-20

[msp35]

Shitty mazda tuning causes bad gas mileage. Either drive slower so you're not in the *rich* spot of our A/F curve. Or buy some EMS, or GTX Gears.
Someone was selling just the 5th gear.

[LEXi73]

i seem to get the best millage at 80mph. The engine seems to run smoother and dosen't vibrate so much. i usually average about 34mpg or so...for a total tank of around 430 give or take a few.

[PlatinumMSP]

yes the msp rev's pretty high at highway speeds, remarkably I still get 29+ mpg on my stock msp, when I was fully modded I was getting 34+ on the freeway

[Brian MP5T]

The MSP is a great city car. If you want High Speed and Low Revs you have to get a better job.. :)

[jmv]

The MSP is a great city car. If you want High Speed and Low Revs you have to get a better job.. :)


hahaha

[orng1]

yes the msp rev's pretty high at highway speeds, remarkably I still get 29+ mpg on my stock msp, when I was fully modded I was getting 34+ on the freeway

Yeah I don't get that either, the MSP gets better fuel economy as you mod it?

[jeffmsp]

its not a v8. what 4 cylinder manual does not rev high on the highway? have you ever driven a honda lol i say its fine, heck if it was lower then you would just bitch about how you need mre passing power on the highway and dont wanna downshift lol some peoples kids i dont know what to tell yas.

[4drboost]

Yeah I don't get that either, the MSP gets better fuel economy as you mod it?

Thats exactly it. When you open up the intake and exhaust, the engine is working less hard to suck air in, and blow air out, in turn giving you better millage (in basic terms) Also with an aftermarket EMS, the air/fuel ratios are better controlled, and the car dosnt run as rich. I could get more into detail, but thats a quick explanation I guess

[Brian MP5T]

Thats exactly it. When you open up the intake and exhaust, the engine is working less hard to suck air in, and blow air out, in turn giving you better millage (in basic terms) Also with an aftermarket EMS, the air/fuel ratios are better controlled, and the car dosnt run as rich. I could get more into detail, but thats a quick explanation I guess

Umm, The ECU will balance the air/fuel regardless... so when you "Port and Polish" lets say and more air goes in, more fuel is added. Better Perfomance, more fuel used.. There is no magical "Free Energy"

Your theory about Fuel Econ is False, sadly.

[jersey_emt]

The relatively high revs are normal. 5th gear is shorter than what it should be IMO.

My MSM has the same problem....in 6th gear, 80mph = 4,000rpm.

[Toolfreak387]

Sometimes i get 40 mpg highway. Its great. On average driving a mix of city and highway I get 32-34mpg. I shift mostly at 3k.

[Jackelope]

want low revs, buy a dodge truck, drove my dads today... 65mph = 1.8k :)

[4drboost]

Umm, The ECU will balance the air/fuel regardless... so when you "Port and Polish" lets say and more air goes in, more fuel is added. Better Perfomance, more fuel used.. There is no magical "Free Energy"

Your theory about Fuel Econ is False, sadly.

Ok, so is it the added horsepower that is in turn giving better fuel economy? If the car have more power than before, it takes less effort/hrottle to get to speeds?

[Brian MP5T]

Ok, so is it the added horsepower that is in turn giving better fuel economy? If the car have more power than before, it takes less effort/hrottle to get to speeds?

Force = Mass x Acceleration

There is no magic. If the car is accelerated at the same rate and has the same weight, then the same force was applied to the car. Therefore, the same energy had to be used to move the car.

[4drboost]

Force = Mass x Acceleration

There is no magic. If the car is accelerated at the same rate and has the same weight, then the same force was applied to the car. Therefore, the same energy had to be used to move the car.

Ok, you do make sense, but how do performance parts i.e. intakes, exhausts, EMS increase fuel economy? What is your theory?

[Kansei]

Yeah I don't get that either, the MSP gets better fuel economy as you mod it?

yup.. at the cost of it being louder, less comfortable, etc.

I get 36.6mpg on my Protege5 (same exact tranny/gearing as the MSP)