I don't want to give up my H3 but I'm looking for ways to increase my MPG.

So far I added a less restrictive CAI, Better flowing Billy Boat exhaust and a tuned PCM.
I've also altered my driving. I'm driving less and when I do I act like I have an egg between my foot and the gas pedal. When my tires wear out I'm thinking about undersizing the tire one width for a smaller foot print. Add about 5 more pounds of air pressure.

Anybody else have other ideas?

 

Go buy yourself a ScanGauge. This was the biggest help to me. I keep the MPG on the screen and keep a close eye on it. I found that my sweet-spot for MPG is about 63 MPH, but in town it is 43 (in fourth gear).

Besides, This is a great way to add a water temp and volt meter along with a way to read fault codes from the computer. Well worth the money.

Here is how they look installed in an H3: LINKY

 

cbetts, your sweet-spot is what I have found also. I'm getting amazing highway mileage keeping it 65 and under. All I have done is do the PCMforLess tune, the AirDoc air intake and switched my entire drivetrain to full synthetic. Just doing those things, I get 375 to 400 Miles per tank before I have to refill.

 

My job is almost 30 miles from home. My wife's part-time job is7 miles. Her car gets 25-26 mpg on my round trip to work and back. My H3 gets about 17. Guess what I drive to work 3 or 4 days a week?

 

I have been getting way better gas mileage due to the summer blend of gasoline. My truck went from giving me 14-15mpgs to now a soild 18.5mpg. No change in driving habits either. I may hit 80mph at times on the freeway (passing someone) but I usually keep it between 65-70mph. No PCM tune here.

 

I'm using Mobile 1 10W-30. Is that what you are using?

 

I use Amsoil 0W-30.

 

0-30?? Is that a typo? 0 Weight seem impossible[sm=smiley25.gif]

 

Denso Iridium spark plugs promise improved MPG. Think its just hype?

 

I use (german) castrol syntec 0w-30.