had my lexus nearly a year, and found the mpg on gas was very low 10mpg on gas, she also started stalling and flat spots and was kicking when driving.also mot tester said it failed on gas as it was all over the place.
so i drove 300 miles each way to autogas 2000 in york.after a test drive they found that when the regulator was changed yrs ago that the system was left on defult.
so i had to have a remap done as the system was running to lean. so on the return trip no kicking or flat spots much better drive.
as for ecomony motorway millage much same but i did get caught in traffic a lot, so i am wating to use my tank around town to see if this improves. fingers crossed.
so a big thanks auto gas :winky:
thought the lpg guys here might find this interesting !