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Originally Posted by caferacer51
Not able to say I'm affraid, financialy I'm only putting fuel in the car to commute.
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It's only a 1-time effort to fill it up completely.
Which is unlikely to become much cheaper anytime soon.
After that, you can be filling up as you burn fuel.
It gives you an opportunity to properly keep track of your fuel use, which is essential if you want to see your improvements over time.
Quote:
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The motorway I use is very busy/undulating making an A-B-A test impossible.
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I purposely don't test modifications (nothing beyond a short functional check, that is).
The testing is in the regular driving, and the fuel economy it returns.
If you keep track of your fuel use, you'll spot the effects over time if they're there.
Don't feel bad because you can't attribute X % better fuel economy to mod Y.
That doesn't really matter.