I sent Tom a PM to find out if turboing will hurt my mpg's under normal driving, not foot to the floor driving, but normal city driving. Any solid information will be greatly appreciated as my car will be paid off next year and I am trying to decide whether to do FI or go NA and which will allow for better mpg's.

My Fusion gets around 25-28 highway, depending on how much AC I use and how heavy my foot is. And thats a larger car than a Focus. I can see a turbo Focus easily achieving 30mpg highway.

A turbo would not affect fuel mileage by itself. Example being, if it takes 50hp to cruise 50mph, that requirement would not change. The mileage is going to suffer in how much fuel you consume getting to 50mph, where in, the turbo equipped car will do that much more quickly with an attendant reduction in fuel economy. This assumes the standard duratec engine without variable valves and tuning found in OEM cars with turbo. Then again, without these technologies limiting HP production vs. maintaining mileage requirements. It's also to be expected it is going to go like snot which will severely challenge the driver to not utilize the available HP at all times. In short! I would expect that your MPG's would be reduced due to driver related causes.
My 2 cents worth! [cheers]

thats like a textbook answer, i like it.[cheers]

Fuel consumption will not change on the highway, usually that will remain the same as a standard NA engine. However fuel consumption on street driving will usually suffer a little, but not much, you may drop a few MPG on the street depending on how you drive.

For example: if you were getting 24MPG on the street, then it may drop to 21MPG.


Thanks,
Vik

so as long as I keep my foot out of it in the city then my mpg's will not vary much. cool and thanks[thumb]

Its all in the way you drive!

Posted via FF Mobile Between Torbo & N/A, you`d actually be better of for mpg with a Turbo. Turbo can help efficiency when your foot isn`t to the floor, while N/A mods optimise for power at high rpm generally losing a bit everywhere else... Years ago had a plymouth champ, then later a dodge turbo colt (same car w/factory turbo) - DD mileage dropped to 25 from 30, and there was always abit of zoom zoom while driving the turbo...(grin)

I have noticed I've gone from the factory 27 mpg range to about 20 mpg intown. The last time I checked my highway milage I had a bunch of stuff crammed in my car and still got 30 mpg on the highway with the extra weight.

so in essence if i drive economically I will save a bit of fuel both hwy/city, but with the extra zoom zoom I may lose mpg's due to the fun my right foot will have... sounds like solid info... thanks

It's all in the tune. My car gets better mpg highway now than it did stock.
This is with a tune based off a tune from Tom.
My previous tune got worse mpg than stock all the time, even though the AFR looked correct.
I think it goes to show how important the timing tables are and not just the AFR.

I owned a turbo probe gt for a while and I got consistent 24mpg around town and over 30 mpg on a trip from ga to westpalm beach fl. Now if I got on it around town then it quickly droped to under 20mpg but that was a 6cyl and not as advanced as these foci motors. But my final though is keep out of it and you'll be fine in the mpg category but if your wanting to go fi then mpg should be the last thing on your mind.

my car averages around 27 even with a couple WOT pulls. i do a lot of highway and city on my drive to work. i had a roush kit with stock motor (zetec)