Reg versus Premium Fuel experiament in 09 PT Cruiser
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From: Ashton Crusher on 1 Nov 2009 19:47 I have pretty much gotten a decent feel for the gas mileage to expect from my PT. The last three tanks averaged about 23 mpg. So when I filled up yesterday I put premium in it instead of regular. It's too early for a definitive answer but so far it looks like it's down 2 mpg over what I'd been getting. About what I expected but I thought I'd test it out.
From: Bill Putney on 1 Nov 2009 20:25 Ashton Crusher wrote: > I have pretty much gotten a decent feel for the gas mileage to expect > from my PT. The last three tanks averaged about 23 mpg. So when I > filled up yesterday I put premium in it instead of regular. It's too > early for a definitive answer but so far it looks like it's down 2 mpg > over what I'd been getting. About what I expected but I thought I'd > test it out. I don't know for sure, but there are those that would say that you have to give your PCM time to adjust to the different fuel to make a meaningful mileage measurement. -- Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my address with the letter 'x')
From: Brent on 1 Nov 2009 21:39 On 2009-11-02, Ashton Crusher <demi(a)moore.net> wrote: > I have pretty much gotten a decent feel for the gas mileage to expect > from my PT. The last three tanks averaged about 23 mpg. So when I > filled up yesterday I put premium in it instead of regular. It's too > early for a definitive answer but so far it looks like it's down 2 mpg > over what I'd been getting. About what I expected but I thought I'd > test it out. It should be down a little. Premium has less energy per unit volume.
From: Jim Yanik on 1 Nov 2009 22:56 Bill Putney <bptn(a)kinez.net> wrote in news:7l6qnpF3c67veU2(a)mid.individual.net: > Ashton Crusher wrote: >> I have pretty much gotten a decent feel for the gas mileage to expect >> from my PT. The last three tanks averaged about 23 mpg. So when I >> filled up yesterday I put premium in it instead of regular. It's too >> early for a definitive answer but so far it looks like it's down 2 mpg >> over what I'd been getting. About what I expected but I thought I'd >> test it out. > > I don't know for sure, but there are those that would say that you have > to give your PCM time to adjust to the different fuel to make a > meaningful mileage measurement. > if the motor is not knocking with regular fuel,then changing to hi-test isn't going to make any difference.ECUs don't have any way of discerning octane levels,and the O2 sensor will not read different for hi-test. that is why running hi-test in a car designed to use regular is a waste of money. -- Jim Yanik jyanik at localnet dot com
From: C. E. White on 2 Nov 2009 08:38
"Brent" <tetraethylleadREMOVETHIS(a)yahoo.com> wrote in message news:hclgpn$tpt$1(a)news.eternal-september.org... > On 2009-11-02, Ashton Crusher <demi(a)moore.net> wrote: >> I have pretty much gotten a decent feel for the gas mileage to >> expect >> from my PT. The last three tanks averaged about 23 mpg. So when I >> filled up yesterday I put premium in it instead of regular. It's >> too >> early for a definitive answer but so far it looks like it's down 2 >> mpg >> over what I'd been getting. About what I expected but I thought >> I'd >> test it out. > > It should be down a little. Premium has less energy per unit volume. That used to be true (say 30 years ago), but these days it is not ture. Ed |