Daily Driver: GTI or 370Z

alcheng · 02-20-2012, 11:08 AM

Quote:

Originally Posted by AhadV

No matter how hard I drive the Z it won't ever match the rx8's mileage. That 1.3 liter rotary ate 14 miles per gallon.. and 17mpg highway. Not to mention the Z is way more fun. Still trying to figure out if anyone has tried regular unleaded to get better gas mileage?

Regular Unleaded will only get you less mpg and dirty engine. Don't try it.

Speedy · 02-20-2012, 11:19 AM

Quote:

Originally Posted by AhadV

No matter how hard I drive the Z it won't ever match the rx8's mileage. That 1.3 liter rotary ate 14 miles per gallon.. and 17mpg highway. Not to mention the Z is way more fun. Still trying to figure out if anyone has tried regular unleaded to get better gas mileage?

A change in octane won't affect mileage, only performance. You can probably run 89 in the car if available, just don't wring it's neck at every red light.

Quote:

Originally Posted by alcheng

Regular Unleaded will only get you less mpg and dirty engine. Don't try it.

Negative ghost rider. It won't make the engine any more clean or dirty. It will just be more prone to knock retard which will force the computer to reduce timing and affect horse power.

alcheng · 02-20-2012, 12:38 PM

Quote:

Originally Posted by Speedy

Negative ghost rider. It won't make the engine any more clean or dirty. It will just be more prone to knock retard which will force the computer to reduce timing and affect horse power.

Have you tried putting 87 in your car? I did try, not on my Z of course. It did give less mpg and stinky exhaust.

Speedy · 02-20-2012, 01:38 PM

Quote:

Originally Posted by alcheng

Have you tried putting 87 in your car? I did try, not on my Z of course. It did give less mpg and stinky exhaust.

Shrug. The only big difference in 87 and 93 is just the octane rating. Some brands use a different additive pack in their premium. Could account for the smell I guess. Catalytic converters burn up anything fuel wise that's left over so it wouldn't be that.

Several years ago I test 87, 89, and 93 in a cross country road trip. This was in a car spec'd for 87 and I got the best gas mileage from 87. Ran two tanks of each fuel to be sure.

Bottom line, just use what the car is spec'd for. With 11:1 compression in the Z motor, premium is your best bet.

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