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63 Posts
I've been running without the IMA system for about 5000 miles. All components are still installed (90+ lbs of dead weight) and the BCM in switched off. In the event anyone with a dead IMA battery decides to go this route, consider this.
With IMA
It's a 2002 5 speed, and formerly got upper 60's to low 80's in warm weather and conservative driving conditions (flat, no A/C, hanging out behind larger vehicles on the freeway, etc.) and 55 - 65 mpg driving like a normal car with no consideration for MPG.
The worst ever tank MPG since I owned the car was 48 mpg during a week of -20 degree F weather in Vermont. Best ever tank MPG was 105 mpg on a slow drive between San Diego and Yuma in the spring.
Without IMA
At any rate, current mileage when not driving conservatively is around 47 mpg and best tank without IMA was 57 mpg. Overall, I would say AVERAGE mileage decrease without IMA is about 20-25%. I have not tried hypermiling without the IMA battery. Even without the IMA system you're still getting better mileage than most vehicles on the road, as long as you don't mind going into second or third up the hills. Also, with the DC/DC converter overload set at 4000 RPM, I try not to exceed that mark which is difficult when driving in hilly terrain.
With IMA
It's a 2002 5 speed, and formerly got upper 60's to low 80's in warm weather and conservative driving conditions (flat, no A/C, hanging out behind larger vehicles on the freeway, etc.) and 55 - 65 mpg driving like a normal car with no consideration for MPG.
The worst ever tank MPG since I owned the car was 48 mpg during a week of -20 degree F weather in Vermont. Best ever tank MPG was 105 mpg on a slow drive between San Diego and Yuma in the spring.
Without IMA
At any rate, current mileage when not driving conservatively is around 47 mpg and best tank without IMA was 57 mpg. Overall, I would say AVERAGE mileage decrease without IMA is about 20-25%. I have not tried hypermiling without the IMA battery. Even without the IMA system you're still getting better mileage than most vehicles on the road, as long as you don't mind going into second or third up the hills. Also, with the DC/DC converter overload set at 4000 RPM, I try not to exceed that mark which is difficult when driving in hilly terrain.