does Tesco 99 go off more than vPower?

duncan · Post by **duncan** » Fri Dec 14, 2007 9:12 pm

Gerry H wrote:So my 20L can is about good enough for the lawn mower :roll:

i run methanol in my lawnmower Gerry - gets the lawn done quicker

sdminus · Post by **sdminus** » Fri Dec 14, 2007 10:22 pm

Depending on the weather yes. This is a grey area for me but i know the people who mix this stuff so i can get a 100 % yes or no. But from my experiance i keep the same batch and less than 48 hrs old.

TBH i would tune on fresh fuel. (try and get it on delivery date)

Try and race on fresh fuel. I only every use one source of fuel and batch add over a weekend and i nver have fuel problems.

I cant be 100 % on this i stick with what i know works for me. This makes it predictable..

Andy916 · Post by **Andy916** » Sat Dec 15, 2007 11:20 am

Gerry H wrote:So my 20L can is about good enough for the lawn mower :roll:

I'd put a detalarm on the lawnmower if I were you :-D

Seriously though, we're talking small differences here. For sure, buy fuel as close to a race or trackday as you can and buy it from a station that has good throughput. Beyond that though, you'll always see some variance in pump fuel.

When I raced bikes it was commonplace to tune GP250 2-strokes to run on Avgas, but I've not heard of its use in cars (trackdaying and low key amateur racing at least). Similar RON/MON/AKI to methanol I think. Octane rating aside, it was regarded as more consistent than regular pump fuel with a similar price (whereas 'proper' Elf race fuel cost 10x as much). Supply was a bit tricky though, with airfields being choosy about who they'd sell it to!

Gerry H · Post by **Gerry H** » Sat Dec 15, 2007 12:23 pm

Back on topic (for the first time)

How does Tesco stand against Vpower for loss of performance over time?

It was always suggested that Optimax went off and it was also possible to get a duff batch. Is Vpower more consistent and/or stable?

And Dunk, do you feel confident to map my mower?

duncan · Post by **duncan** » Sat Dec 15, 2007 12:30 pm

Gerry - It is a secret but I am planning to launch a mower mapping business in the new year to pay for TA. It is an oft overlooked area of grass cutting performance.

back to topic [again]

I think it is a lottery as to whether it is a good batch bad batch or whatever, I will stick by the rule of filling up tanks and jerry cans the night before events - from my recent mapping on tesco 99 vs Vpower, I reckon vpower nudges it. But what do I know