Quote:
Originally Posted by rmay635703
Something else you can do but everybody here hates is to reprogram the ECU the hard way using some of the freeware ECM utilities and move your maps past stoich in your highway cruise region (if you cruise on the highway a fair amount) thats good for about 2-4mpg in of itself. You need a good bit of tuning knowledge and patience to pull it off properly though.
Just make sure you can flop back and forth.
Good Luck
Ryan
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What's the scoop on this freeware ECU tuning?
I've looked at a service to reprogram the ECU for my '03 Silverado. One that caught my eye claims 1-3mpg improvement (Not much on a Prius, huge on a full size truck). The thing that has stopped me is cost. $200+ for a mod that may or may not improve efficiency. A free utility to play with sounds interesting, but you still need a ECU -> PC interface of some sort...
Mike