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Hello and welcome.
I am not very knowledgeable about chip tuning on gas engine but I believe it has to do with boosting fuel pressure to restore performance potential that is already there before the car emissions are taken into account.
I don't think chip tuning is gonna allow for more MPG out of a gas engine.
At least it depends on the route you have to use.
Maybe if you do a fair amount of highway it can improve the pulse of your pulse & glide ?
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