Anyone use it in there Rover? I might have access to it and wondered if it was worth the extra 20 cents a gallon vs premium(91).

 

Is it leaded or unleaded?
Chances are, although you will get a lot more power, you will fry your valves and seals, kind of like run avaition fuel, fun but costly.

 

Higher octane gas burns slower. If your engine cannot increase the effective compression ratio (like with a turbo) or if it cannot significantly advance the timing, you'll likely notice LESS performance not more.

 

What? No... just no.

Leaded high octane (also known as AVGAS, or Aviation Gasoline) will ruin your catalytic converters in short order, and might (but likely won't) cause injector problems.

Unleaded high octane will combust slower, resulting in slightly higher HC's in the exhaust stream, and if the stock tuned ECU tries to compensate you may end up with a power reduction. The only exception to this is if your ECU is specifically tuned to use a high octane fuel, then yes, you can expect an increase in power over a standard octane.

What won't happen, however, is:
- Frying of the valves and seals. They'll be just fine.
- Powahhh! There will be no increase (unless tuned for high octane).

 

So where do all these rumors of increased performance and mpg's without the ethanol and other additives come from?

 

Vehicles that can advance timing benefit exponentially from higher octane gas. I do not think the Rover V8 can do that.

 

Those are not rumors, those are facts.
Ethanol has less power per gallon than gasoline BUT it produces little to no emissions, so mixing it with gasoline reduces the pollutants from burning gasoline.
Take out the ethanol and you will increase MPG and power, you will not notice a power increase but if you were to do a dyno run, it would show on the computer.
These trucks are tuned to run 91 octane or higher, if you can get 89 non-ethanol you will be better off running that vs a 93 octane E-10 (10% ethanol)mix.
E-85 (85% ethanol)is 105 octane.
You can run 110 octane in a normal engine with no problems, will NOT hurt the engine in any way shape or form.
Anything over 110 octane will melt your pistons and valves, wont happen over night, but it will happen.

 

When I raced we ran 110 octane leaded gas, that was with carbs and dizzy's so we just advanced the timing and ran her in the "sweet" spot.

 

I'm sure the exhaust from that bad boy brought a tear to your eye

 

There is no smell sweeter than that of pure raw untreated 110 octane exhaust.